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manual-javascript

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JavaScript 是一种具有函数优先的轻量级、解释型、即时编译型的编程语言。

github.com/kuriv/manual-javascript

kuriv/manual-javascript

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        <a href=".." >对象使用</a>
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                                <h1 id="&#x5BF9;&#x8C61;&#x4F7F;&#x7528;">&#x5BF9;&#x8C61;&#x4F7F;&#x7528;</h1>
<p>&#x6267;&#x884C;&#x4E0B;&#x9762;&#x7684;&#x4EE3;&#x7801;&#xFF0C;&#x58F0;&#x660E;&#x5BF9;&#x8C61;&#x5E76;&#x8BBF;&#x95EE;&#x5176;&#x5C5E;&#x6027;&#x3002;</p>
<pre class="language-"><code class="lang-javascript"><span class="token keyword">let</span> obj <span class="token operator">=</span> <span class="token punctuation">{</span>
    name<span class="token operator">:</span> <span class="token string">&apos;Tom&apos;</span><span class="token punctuation">,</span>
    age<span class="token operator">:</span> <span class="token number">18</span><span class="token punctuation">,</span>
    <span class="token string">&apos;user-name&apos;</span><span class="token operator">:</span> <span class="token string">&apos;Tom&apos;</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>obj<span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>obj<span class="token punctuation">.</span>name<span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>obj<span class="token punctuation">.</span>age<span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>obj<span class="token punctuation">[</span><span class="token string">&apos;user-name&apos;</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<p>&#x6267;&#x884C;&#x4E0B;&#x9762;&#x7684;&#x4EE3;&#x7801;&#xFF0C;&#x5220;&#x9664;&#x5BF9;&#x8C61;&#x4E2D;&#x7684;&#x6307;&#x5B9A;&#x5C5E;&#x6027;&#x3002;</p>
<pre class="language-"><code class="lang-javascript"><span class="token keyword">let</span> obj <span class="token operator">=</span> <span class="token punctuation">{</span>
    name<span class="token operator">:</span> <span class="token string">&apos;Tom&apos;</span><span class="token punctuation">,</span>
    age<span class="token operator">:</span> <span class="token number">18</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>obj<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">delete</span> obj<span class="token punctuation">.</span>name<span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>obj<span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>obj<span class="token punctuation">.</span>name<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<p>&#x6267;&#x884C;&#x4E0B;&#x9762;&#x7684;&#x4EE3;&#x7801;&#xFF0C;&#x58F0;&#x660E;&#x5BF9;&#x8C61;&#x5E76;&#x8BBF;&#x95EE;&#x5176;&#x65B9;&#x6CD5;&#x3002;</p>
<pre class="language-"><code class="lang-javascript"><span class="token keyword">let</span> obj <span class="token operator">=</span> <span class="token punctuation">{</span>
    <span class="token function-variable function">func</span><span class="token operator">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">return</span> <span class="token string">&apos;Hello World!&apos;</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>obj<span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>obj<span class="token punctuation">.</span><span class="token function">func</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<p>&#x6267;&#x884C;&#x4E0B;&#x9762;&#x7684;&#x4EE3;&#x7801;&#xFF0C;&#x904D;&#x5386;&#x5BF9;&#x8C61;&#x4E2D;&#x7684;&#x6240;&#x6709;&#x5C5E;&#x6027;&#x4E0E;&#x65B9;&#x6CD5;&#x3002;</p>
<pre class="language-"><code class="lang-javascript"><span class="token keyword">let</span> obj <span class="token operator">=</span> <span class="token punctuation">{</span>
    name<span class="token operator">:</span> <span class="token string">&apos;Tom&apos;</span><span class="token punctuation">,</span>
    age<span class="token operator">:</span> <span class="token number">18</span><span class="token punctuation">,</span>
    <span class="token function-variable function">func</span><span class="token operator">:</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">return</span> <span class="token string">&apos;Hello World!&apos;</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>Object<span class="token punctuation">.</span><span class="token function">keys</span><span class="token punctuation">(</span>obj<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>Object<span class="token punctuation">.</span><span class="token function">values</span><span class="token punctuation">(</span>obj<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>Object<span class="token punctuation">.</span><span class="token function">entries</span><span class="token punctuation">(</span>obj<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">let</span> k <span class="token keyword">in</span> obj<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>k<span class="token punctuation">,</span> obj<span class="token punctuation">[</span>k<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre>
<p>&#x6267;&#x884C;&#x4E0B;&#x9762;&#x7684;&#x4EE3;&#x7801;&#xFF0C;&#x4F7F;&#x7528; Symbol &#x4F5C;&#x4E3A;&#x5BF9;&#x8C61;&#x5C5E;&#x6027;&#x540D;&#x6216;&#x65B9;&#x6CD5;&#x540D;&#x3002;</p>
<pre class="language-"><code class="lang-javascript"><span class="token keyword">let</span> name <span class="token operator">=</span> <span class="token function">Symbol</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">let</span> age <span class="token operator">=</span> <span class="token function">Symbol</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">let</span> func <span class="token operator">=</span> <span class="token function">Symbol</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">let</span> obj <span class="token operator">=</span> <span class="token punctuation">{</span>
    <span class="token punctuation">[</span>name<span class="token punctuation">]</span><span class="token operator">:</span> <span class="token string">&apos;Tom&apos;</span><span class="token punctuation">,</span>
    <span class="token punctuation">[</span>age<span class="token punctuation">]</span><span class="token operator">:</span> <span class="token number">18</span><span class="token punctuation">,</span>
    <span class="token punctuation">[</span>func<span class="token punctuation">]</span><span class="token operator">:</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">return</span> <span class="token string">&apos;Hello World!&apos;</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>obj<span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>obj<span class="token punctuation">[</span>name<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>obj<span class="token punctuation">[</span>age<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>obj<span class="token punctuation">[</span>func<span class="token punctuation">]</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<p>&#x6267;&#x884C;&#x4E0B;&#x9762;&#x7684;&#x4EE3;&#x7801;&#xFF0C;&#x4F7F;&#x7528;&#x89E3;&#x6784;&#x8BED;&#x6CD5;&#x4E3A;&#x53D8;&#x91CF;&#x8D4B;&#x503C;&#x3002;</p>
<pre class="language-"><code class="lang-javascript"><span class="token keyword">let</span> obj <span class="token operator">=</span> <span class="token punctuation">{</span>
    name<span class="token operator">:</span> <span class="token string">&apos;Tom&apos;</span><span class="token punctuation">,</span>
    age<span class="token operator">:</span> <span class="token number">18</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token keyword">let</span> <span class="token punctuation">{</span> name<span class="token punctuation">,</span> age <span class="token punctuation">}</span> <span class="token operator">=</span> obj<span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>name<span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>age<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<p>&#x6784;&#x9020;&#x51FD;&#x6570;&#x662F;&#x4E00;&#x79CD;&#x7279;&#x6B8A;&#x7684;&#x51FD;&#x6570;&#xFF0C;&#x4E3B;&#x8981;&#x7528;&#x6765;&#x521D;&#x59CB;&#x5316;&#x5BF9;&#x8C61;&#x3002;</p>
<pre class="language-"><code class="lang-javascript"><span class="token keyword">function</span> <span class="token function">Person</span><span class="token punctuation">(</span><span class="token parameter">name<span class="token punctuation">,</span> age</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>name <span class="token operator">=</span> name<span class="token punctuation">;</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>age <span class="token operator">=</span> age<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">const</span> Tom <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Person</span><span class="token punctuation">(</span><span class="token string">&apos;Tom&apos;</span><span class="token punctuation">,</span> <span class="token number">20</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> Jerry <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Person</span><span class="token punctuation">(</span><span class="token string">&apos;Jerry&apos;</span><span class="token punctuation">,</span> <span class="token number">18</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>Tom<span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>Jerry<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<p>&#x6784;&#x9020;&#x51FD;&#x6570;&#x7684;&#x5C5E;&#x6027;&#x548C;&#x65B9;&#x6CD5;&#x88AB;&#x79F0;&#x4E3A;&#x9759;&#x6001;&#x5C5E;&#x6027;&#x548C;&#x9759;&#x6001;&#x65B9;&#x6CD5;&#x3002;</p>
<pre class="language-"><code class="lang-javascript"><span class="token keyword">function</span> <span class="token function">Person</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span><span class="token punctuation">}</span>
Person<span class="token punctuation">.</span>username <span class="token operator">=</span> <span class="token string">&apos;anonymous&apos;</span><span class="token punctuation">;</span>
Person<span class="token punctuation">.</span><span class="token function-variable function">call</span> <span class="token operator">=</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">&apos;Hello World!&apos;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>Person<span class="token punctuation">.</span>username<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">Person</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<p>&#x5728; JavaScript &#x4E2D;&#x6240;&#x6709;&#x6784;&#x9020;&#x51FD;&#x6570;&#x4E2D;&#x90FD;&#x5B58;&#x5728;&#x4E00;&#x4E2A;&#x539F;&#x578B;&#x5BF9;&#x8C61;&#x3002;</p>
<pre class="language-"><code class="lang-javascript"><span class="token keyword">function</span> <span class="token function">Person</span><span class="token punctuation">(</span><span class="token parameter">name<span class="token punctuation">,</span> age</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>name <span class="token operator">=</span> name<span class="token punctuation">;</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>age <span class="token operator">=</span> age<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token class-name">Person</span><span class="token punctuation">.</span>prototype<span class="token punctuation">.</span><span class="token function-variable function">call</span> <span class="token operator">=</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">&apos;Hello World!&apos;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">const</span> Tom <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Person</span><span class="token punctuation">(</span><span class="token string">&apos;Tom&apos;</span><span class="token punctuation">,</span> <span class="token number">20</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> Jerry <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Person</span><span class="token punctuation">(</span><span class="token string">&apos;Jerry&apos;</span><span class="token punctuation">,</span> <span class="token number">18</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>Tom<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">Tom</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>Jerry<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">Jerry</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
</code></pre>
<p>&#x6267;&#x884C;&#x4E0B;&#x9762;&#x7684;&#x4EE3;&#x7801;&#xFF0C;&#x7528;&#x5B9A;&#x4E49;&#x7C7B;&#x7684;&#x65B9;&#x5F0F;&#x6765;&#x58F0;&#x660E;&#x5BF9;&#x8C61;&#x3002;</p>
<pre class="language-"><code class="lang-javascript"><span class="token keyword">class</span> <span class="token class-name">Person</span> <span class="token punctuation">{</span>
    name <span class="token operator">=</span> <span class="token string">&apos;anonymous&apos;</span><span class="token punctuation">;</span>
    age <span class="token operator">=</span> <span class="token number">18</span><span class="token punctuation">;</span>
    <span class="token function">constructor</span><span class="token punctuation">(</span><span class="token parameter">name<span class="token punctuation">,</span> age</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>name <span class="token operator">=</span> name<span class="token punctuation">;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>age <span class="token operator">=</span> age<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token keyword">const</span> Tom <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Person</span><span class="token punctuation">(</span><span class="token string">&apos;tom&apos;</span><span class="token punctuation">,</span> <span class="token number">20</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>Tom<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<p>&#x6267;&#x884C;&#x4E0B;&#x9762;&#x7684;&#x4EE3;&#x7801;&#xFF0C;&#x5B9E;&#x73B0;&#x7C7B;&#x7684;&#x7EE7;&#x627F;&#x3002;</p>
<pre class="language-"><code class="lang-javascript"><span class="token keyword">class</span> <span class="token class-name">Person</span> <span class="token punctuation">{</span>
    name <span class="token operator">=</span> <span class="token string">&apos;anonymous&apos;</span><span class="token punctuation">;</span>
    age <span class="token operator">=</span> <span class="token number">18</span><span class="token punctuation">;</span>
    <span class="token function">constructor</span><span class="token punctuation">(</span><span class="token parameter">name<span class="token punctuation">,</span> age</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>name <span class="token operator">=</span> name<span class="token punctuation">;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>age <span class="token operator">=</span> age<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
    <span class="token function">func</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">return</span> <span class="token punctuation">[</span><span class="token keyword">this</span><span class="token punctuation">.</span>name<span class="token punctuation">,</span> <span class="token keyword">this</span><span class="token punctuation">.</span>age<span class="token punctuation">]</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token keyword">class</span> <span class="token class-name">SmartPerson</span> <span class="token keyword">extends</span> <span class="token class-name">Person</span> <span class="token punctuation">{</span>
    gender<span class="token punctuation">;</span>
    <span class="token function">constructor</span><span class="token punctuation">(</span><span class="token parameter">name<span class="token punctuation">,</span> age<span class="token punctuation">,</span> gender</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">super</span><span class="token punctuation">(</span>name<span class="token punctuation">,</span> age<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>gender <span class="token operator">=</span> gender<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
    <span class="token function">func</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">return</span> <span class="token punctuation">[</span><span class="token keyword">this</span><span class="token punctuation">.</span>name<span class="token punctuation">,</span> <span class="token keyword">this</span><span class="token punctuation">.</span>age<span class="token punctuation">,</span> <span class="token keyword">this</span><span class="token punctuation">.</span>gender<span class="token punctuation">]</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token keyword">const</span> Tom <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Person</span><span class="token punctuation">(</span><span class="token string">&apos;tom&apos;</span><span class="token punctuation">,</span> <span class="token number">20</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>Tom<span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>Tom<span class="token punctuation">.</span><span class="token function">func</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> Jerry <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">SmartPerson</span><span class="token punctuation">(</span><span class="token string">&apos;jerry&apos;</span><span class="token punctuation">,</span> <span class="token number">18</span><span class="token punctuation">,</span> <span class="token string">&apos;female&apos;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>Jerry<span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>Jerry<span class="token punctuation">.</span><span class="token function">func</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<p>&#x6267;&#x884C;&#x4E0B;&#x9762;&#x7684;&#x4EE3;&#x7801;&#xFF0C;&#x5B9A;&#x4E49;&#x5E76;&#x8BBF;&#x95EE;&#x5BF9;&#x8C61;&#x4E2D;&#x7684;&#x79C1;&#x6709;&#x5C5E;&#x6027;&#x3002;</p>
<pre class="language-"><code class="lang-javascript"><span class="token keyword">class</span> <span class="token class-name">Person</span> <span class="token punctuation">{</span>
    name <span class="token operator">=</span> <span class="token string">&apos;anonymous&apos;</span><span class="token punctuation">;</span>
    #age <span class="token operator">=</span> <span class="token number">18</span><span class="token punctuation">;</span>
    <span class="token function">constructor</span><span class="token punctuation">(</span><span class="token parameter">name<span class="token punctuation">,</span> age</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>name <span class="token operator">=</span> name<span class="token punctuation">;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>#age <span class="token operator">=</span> age<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
    <span class="token function">func</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">return</span> <span class="token keyword">this</span><span class="token punctuation">.</span>#age<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token keyword">const</span> Tom <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Person</span><span class="token punctuation">(</span><span class="token string">&apos;tom&apos;</span><span class="token punctuation">,</span> <span class="token number">20</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>Tom<span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>Tom<span class="token punctuation">.</span>name<span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>Tom<span class="token punctuation">.</span><span class="token function">func</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<p>&#x6267;&#x884C;&#x4E0B;&#x9762;&#x7684;&#x4EE3;&#x7801;&#xFF0C;&#x81EA;&#x5B9A;&#x4E49;&#x7C7B;&#x7684;&#x8BFB;&#x53D6;&#x548C;&#x4FEE;&#x6539;&#x884C;&#x4E3A;&#x3002;</p>
<pre class="language-"><code class="lang-javascript"><span class="token keyword">class</span> <span class="token class-name">Person</span> <span class="token punctuation">{</span>
    name <span class="token operator">=</span> <span class="token string">&apos;anonymous&apos;</span><span class="token punctuation">;</span>
    <span class="token keyword">get</span> <span class="token function">name</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">return</span> <span class="token keyword">this</span><span class="token punctuation">.</span>name<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
    <span class="token keyword">set</span> <span class="token function">name</span><span class="token punctuation">(</span><span class="token parameter">name</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>name <span class="token operator">=</span> name<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token keyword">const</span> Tom <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Person</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>Tom<span class="token punctuation">.</span>name<span class="token punctuation">)</span><span class="token punctuation">;</span>
Tom<span class="token punctuation">.</span>name <span class="token operator">=</span> <span class="token string">&apos;tom&apos;</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>Tom<span class="token punctuation">.</span>name<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<p>&#x6267;&#x884C;&#x4E0B;&#x9762;&#x7684;&#x4EE3;&#x7801;&#xFF0C;&#x4F7F;&#x7528;&#x53EF;&#x9009;&#x94FE;&#x64CD;&#x4F5C;&#x7B26;&#x8BBF;&#x95EE;&#x6307;&#x5B9A;&#x53D8;&#x91CF;&#x3002;</p>
<pre class="language-"><code class="lang-javascript"><span class="token keyword">const</span> person <span class="token operator">=</span> <span class="token punctuation">{</span>
    name<span class="token operator">:</span> <span class="token string">&apos;tom&apos;</span><span class="token punctuation">,</span>
    age<span class="token operator">:</span> <span class="token number">20</span><span class="token punctuation">,</span>
    call<span class="token operator">:</span> <span class="token punctuation">{</span>
        foo<span class="token operator">:</span> <span class="token string">&apos;bar&apos;</span><span class="token punctuation">,</span>
        <span class="token function-variable function">func</span><span class="token operator">:</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token string">&apos;Hello World!&apos;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>person<span class="token operator">?.</span>call<span class="token operator">?.</span>foo<span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>person<span class="token operator">?.</span>call<span class="token operator">?.</span>bar<span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>person<span class="token operator">?.</span>call<span class="token operator">?.</span><span class="token function">func</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<p>&#x6267;&#x884C;&#x4E0B;&#x9762;&#x7684;&#x4EE3;&#x7801;&#xFF0C;&#x4F7F;&#x7528;&#x7A7A;&#x503C;&#x5408;&#x5E76;&#x64CD;&#x4F5C;&#x7B26;&#x8BBF;&#x95EE;&#x6307;&#x5B9A;&#x53D8;&#x91CF;&#x3002;</p>
<pre class="language-"><code class="lang-javascript"><span class="token keyword">let</span> num<span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>num <span class="token operator">??</span> <span class="token number">233</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
num <span class="token operator">??</span><span class="token operator">=</span> <span class="token number">233</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>num<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<p>Math &#x5BF9;&#x8C61;&#x4E2D;&#x5305;&#x542B;&#x4E86; JavaScript &#x63D0;&#x4F9B;&#x7684;&#x4E00;&#x7CFB;&#x5217;&#x6570;&#x5B66;&#x8FD0;&#x7B97;&#x65B9;&#x6CD5;&#x3002;</p>
<pre class="language-"><code class="lang-javascript">console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>Math<span class="token punctuation">.</span><span class="token function">random</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>Math<span class="token punctuation">.</span><span class="token function">ceil</span><span class="token punctuation">(</span><span class="token number">3.7</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>Math<span class="token punctuation">.</span><span class="token function">floor</span><span class="token punctuation">(</span><span class="token number">3.7</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>Math<span class="token punctuation">.</span><span class="token function">max</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>Math<span class="token punctuation">.</span><span class="token function">min</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>Math<span class="token punctuation">.</span><span class="token function">pow</span><span class="token punctuation">(</span><span class="token number">3</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>Math<span class="token punctuation">.</span><span class="token function">abs</span><span class="token punctuation">(</span><span class="token operator">-</span><span class="token number">233</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>Math<span class="token punctuation">.</span><span class="token function">trunc</span><span class="token punctuation">(</span><span class="token number">3.5</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>Math<span class="token punctuation">.</span><span class="token function">sign</span><span class="token punctuation">(</span><span class="token number">100</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>Math<span class="token punctuation">.</span><span class="token function">sign</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>Math<span class="token punctuation">.</span><span class="token function">sign</span><span class="token punctuation">(</span><span class="token operator">-</span><span class="token number">100</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token keyword">function</span> <span class="token function">equal</span><span class="token punctuation">(</span><span class="token parameter">a<span class="token punctuation">,</span> b</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> Math<span class="token punctuation">.</span><span class="token function">abs</span><span class="token punctuation">(</span>a <span class="token operator">-</span> b<span class="token punctuation">)</span> <span class="token operator">&lt;</span> Number<span class="token punctuation">.</span><span class="token constant">EPSILON</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token number">0.1</span> <span class="token operator">+</span> <span class="token number">0.2</span> <span class="token operator">===</span> <span class="token number">0.3</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token function">equal</span><span class="token punctuation">(</span><span class="token number">0.1</span> <span class="token operator">+</span> <span class="token number">0.2</span><span class="token punctuation">,</span> <span class="token number">0.3</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<p>Number &#x5BF9;&#x8C61;&#x5305;&#x542B;&#x4E86; JavaScript &#x63D0;&#x4F9B;&#x7684;&#x4E00;&#x7CFB;&#x5217;&#x6570;&#x503C;&#x5904;&#x7406;&#x65B9;&#x6CD5;&#x3002;</p>
<pre class="language-"><code class="lang-javascript">console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>Number<span class="token punctuation">.</span><span class="token function">isFinite</span><span class="token punctuation">(</span><span class="token number">100</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>Number<span class="token punctuation">.</span><span class="token function">isFinite</span><span class="token punctuation">(</span><span class="token number">100</span> <span class="token operator">/</span> <span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>Number<span class="token punctuation">.</span><span class="token function">isFinite</span><span class="token punctuation">(</span><span class="token number">Infinity</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>Number<span class="token punctuation">.</span><span class="token function">isNaN</span><span class="token punctuation">(</span><span class="token number">233</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>Number<span class="token punctuation">.</span><span class="token function">isInteger</span><span class="token punctuation">(</span><span class="token number">666</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>Number<span class="token punctuation">.</span><span class="token function">isInteger</span><span class="token punctuation">(</span><span class="token number">1.23</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>Number<span class="token punctuation">.</span><span class="token function">parseInt</span><span class="token punctuation">(</span><span class="token string">&apos;233Hello&apos;</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>Number<span class="token punctuation">.</span><span class="token function">parseFloat</span><span class="token punctuation">(</span><span class="token string">&apos;3.1415926World&apos;</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<p>Date &#x5BF9;&#x8C61;&#x4E2D;&#x5305;&#x542B;&#x4E86; JavaScript &#x63D0;&#x4F9B;&#x7684;&#x4E00;&#x7CFB;&#x5217;&#x65E5;&#x671F;&#x64CD;&#x4F5C;&#x65B9;&#x6CD5;&#x3002;</p>
<pre class="language-"><code class="lang-javascript"><span class="token keyword">const</span> date <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Date</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>date<span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>date<span class="token punctuation">.</span><span class="token function">getFullYear</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>date<span class="token punctuation">.</span><span class="token function">getMonth</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>date<span class="token punctuation">.</span><span class="token function">getDay</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>date<span class="token punctuation">.</span><span class="token function">getHours</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>date<span class="token punctuation">.</span><span class="token function">getMinutes</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>date<span class="token punctuation">.</span><span class="token function">getSeconds</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>Date<span class="token punctuation">.</span><span class="token function">now</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<p>Object &#x5BF9;&#x8C61;&#x4E2D;&#x5305;&#x542B;&#x4E86; JavaScript &#x63D0;&#x4F9B;&#x7684;&#x4E00;&#x7CFB;&#x5217;&#x5BF9;&#x8C61;&#x64CD;&#x4F5C;&#x65B9;&#x6CD5;&#x3002;</p>
<pre class="language-"><code class="lang-javascript">console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>Object<span class="token punctuation">.</span><span class="token function">is</span><span class="token punctuation">(</span><span class="token number">233</span><span class="token punctuation">,</span> <span class="token number">233</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>Object<span class="token punctuation">.</span><span class="token function">is</span><span class="token punctuation">(</span><span class="token number">NaN</span><span class="token punctuation">,</span> <span class="token number">NaN</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">let</span> obj1 <span class="token operator">=</span> <span class="token punctuation">{</span>
    name<span class="token operator">:</span> <span class="token string">&apos;Tom&apos;</span><span class="token punctuation">,</span>
    age<span class="token operator">:</span> <span class="token number">20</span><span class="token punctuation">,</span>
    <span class="token function-variable function">func</span><span class="token operator">:</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">return</span> <span class="token string">&apos;Hello World!&apos;</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token keyword">let</span> obj2 <span class="token operator">=</span> <span class="token punctuation">{</span>
    name<span class="token operator">:</span> <span class="token string">&apos;Jerry&apos;</span><span class="token punctuation">,</span>
    age<span class="token operator">:</span> <span class="token number">18</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>Object<span class="token punctuation">.</span><span class="token function">assign</span><span class="token punctuation">(</span>obj1<span class="token punctuation">,</span> obj2<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<p>ES11 &#x5F15;&#x5165;&#x4E86; globalThis &#x5185;&#x7F6E;&#x5BF9;&#x8C61;&#xFF0C;&#x76EE;&#x7684;&#x662F;&#x4E3A;&#x6240;&#x6709; JavaScript &#x8FD0;&#x884C;&#x73AF;&#x5883;&#x63D0;&#x4F9B;&#x6807;&#x51C6;&#x5316;&#x63A5;&#x53E3;&#x6765;&#x8BBF;&#x95EE;&#x5168;&#x5C40;&#x5BF9;&#x8C61;&#x3002;</p>
<pre class="language-"><code class="lang-javascript">console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>globalThis<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<p>&#x6267;&#x884C;&#x4E0B;&#x9762;&#x7684;&#x4EE3;&#x7801;&#xFF0C;&#x63A7;&#x5236;&#x6D4F;&#x89C8;&#x5668;&#x524D;&#x8FDB;&#x4E0E;&#x540E;&#x9000;&#x3002;</p>
<pre class="language-"><code class="lang-javascript">history<span class="token punctuation">.</span><span class="token function">back</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
history<span class="token punctuation">.</span><span class="token function">forward</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>

                                
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