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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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                                <h1 id="&#x5F02;&#x6B65;&#x7F16;&#x7A0B;">&#x5F02;&#x6B65;&#x7F16;&#x7A0B;</h1>
<p>Promise &#x662F; JavaScript &#x4E2D;&#x7528;&#x4E8E;&#x5904;&#x7406;&#x5F02;&#x6B65;&#x64CD;&#x4F5C;&#x7684;&#x6838;&#x5FC3;&#x5BF9;&#x8C61;&#xFF0C;&#x6709;&#x6548;&#x907F;&#x514D;&#x4E86;&#x4F20;&#x7EDF;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#x7684;&#x5D4C;&#x5957;&#x95EE;&#x9898;&#x3002;</p>
<pre class="language-"><code class="lang-javascript"><span class="token keyword">let</span> flag <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> promise <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Promise</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">resolve<span class="token punctuation">,</span> reject</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    flag <span class="token operator">?</span> <span class="token function">resolve</span><span class="token punctuation">(</span><span class="token string">&apos;Successful.&apos;</span><span class="token punctuation">)</span> <span class="token operator">:</span> <span class="token function">reject</span><span class="token punctuation">(</span><span class="token string">&apos;Unsuccessful.&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 punctuation">;</span>
promise<span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span>
    <span class="token parameter">data</span> <span class="token operator">=&gt;</span> console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token parameter">error</span> <span class="token operator">=&gt;</span> console<span class="token punctuation">.</span><span class="token function">error</span><span class="token punctuation">(</span>error<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;&#x901A;&#x8FC7;&#x5F02;&#x6B65;&#x7F16;&#x7A0B;&#x4E32;&#x884C;&#x6267;&#x884C;&#x591A;&#x4E2A;&#x64CD;&#x4F5C;&#x3002;</p>
<pre class="language-"><code class="lang-javascript"><span class="token keyword">const</span> promise <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Promise</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">resolve<span class="token punctuation">,</span> reject</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token function">setTimeout</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</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;Successful #1.&apos;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token function">resolve</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token string">&apos;foo&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 punctuation">,</span> <span class="token number">1000</span><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>
promise
    <span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token parameter">data</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
        <span class="token keyword">return</span> <span class="token keyword">new</span> <span class="token class-name">Promise</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">resolve<span class="token punctuation">,</span> reject</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
            <span class="token function">setTimeout</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</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;Successful #2.&apos;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                data<span class="token punctuation">.</span><span class="token function">push</span><span class="token punctuation">(</span><span class="token string">&apos;bar&apos;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                <span class="token function">resolve</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token number">1000</span><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>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
    <span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token parameter">data</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
        <span class="token keyword">return</span> <span class="token keyword">new</span> <span class="token class-name">Promise</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">resolve<span class="token punctuation">,</span> reject</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
            <span class="token function">setTimeout</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</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;Successful #3.&apos;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                data<span class="token punctuation">.</span><span class="token function">push</span><span class="token punctuation">(</span><span class="token string">&apos;baz&apos;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                <span class="token function">resolve</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token number">1000</span><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>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
    <span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token parameter">data</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
        console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>data<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>
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>
</code></pre>
<p>&#x6267;&#x884C;&#x4E0B;&#x9762;&#x7684;&#x4EE3;&#x7801;&#xFF0C;&#x6355;&#x83B7;&#x5F02;&#x6B65;&#x7F16;&#x7A0B;&#x4E2D;&#x7684;&#x5931;&#x8D25;&#x4FE1;&#x606F;&#x3002;</p>
<pre class="language-"><code class="lang-javascript"><span class="token keyword">const</span> promise <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Promise</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">resolve<span class="token punctuation">,</span> reject</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token function">setTimeout</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
        <span class="token function">reject</span><span class="token punctuation">(</span><span class="token string">&apos;Unsuccessful.&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 number">1000</span><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>
promise<span class="token punctuation">.</span><span class="token function">catch</span><span class="token punctuation">(</span><span class="token parameter">error</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    console<span class="token punctuation">.</span><span class="token function">error</span><span class="token punctuation">(</span>error<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;&#x6A21;&#x62DF;&#x5F02;&#x6B65;&#x7F16;&#x7A0B;&#x4E32;&#x884C;&#x6267;&#x884C;&#x591A;&#x4E2A; HTTP &#x8BF7;&#x6C42;&#x3002;</p>
<pre class="language-"><code class="lang-javascript"><span class="token keyword">let</span> result <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token function">fetch</span><span class="token punctuation">(</span><span class="token string">&apos;https://api.example.com/users&apos;</span><span class="token punctuation">)</span>
    <span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token parameter">response</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>response<span class="token punctuation">.</span>ok<span class="token punctuation">)</span> <span class="token punctuation">{</span>
            <span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">Error</span><span class="token punctuation">(</span><span class="token string">&apos;Unsuccessful #1.&apos;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        <span class="token keyword">return</span> response<span class="token punctuation">.</span><span class="token function">json</span><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>
    <span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token parameter">data</span> <span class="token operator">=&gt;</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;Successful #1.&apos;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        result<span class="token punctuation">.</span><span class="token function">push</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">return</span> <span class="token function">fetch</span><span class="token punctuation">(</span><span class="token string">&apos;https://api.example.com/orders&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 punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token parameter">response</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>response<span class="token punctuation">.</span>ok<span class="token punctuation">)</span> <span class="token punctuation">{</span>
            <span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">Error</span><span class="token punctuation">(</span><span class="token string">&apos;Unsuccessful #2.&apos;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        <span class="token keyword">return</span> response<span class="token punctuation">.</span><span class="token function">json</span><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>
    <span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token parameter">data</span> <span class="token operator">=&gt;</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;Successful #2.&apos;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        result<span class="token punctuation">.</span><span class="token function">push</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">return</span> <span class="token function">fetch</span><span class="token punctuation">(</span><span class="token string">&apos;https://api.example.com/goods&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 punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token parameter">response</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>response<span class="token punctuation">.</span>ok<span class="token punctuation">)</span> <span class="token punctuation">{</span>
            <span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">Error</span><span class="token punctuation">(</span><span class="token string">&apos;Unsuccessful #3.&apos;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        <span class="token keyword">return</span> response<span class="token punctuation">.</span><span class="token function">json</span><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>
    <span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token parameter">data</span> <span class="token operator">=&gt;</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;Successful #3.&apos;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        result<span class="token punctuation">.</span><span class="token function">push</span><span class="token punctuation">(</span>data<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><span class="token function">catch</span><span class="token punctuation">(</span><span class="token parameter">error</span> <span class="token operator">=&gt;</span> console<span class="token punctuation">.</span><span class="token function">error</span><span class="token punctuation">(</span>error<span class="token punctuation">)</span><span class="token punctuation">)</span>
    <span class="token punctuation">.</span><span class="token function">finally</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>result<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>
</code></pre>
<p>&#x6267;&#x884C;&#x4E0B;&#x9762;&#x7684;&#x4EE3;&#x7801;&#xFF0C;&#x6A21;&#x62DF;&#x5F02;&#x6B65;&#x7F16;&#x7A0B;&#x5E76;&#x884C;&#x6267;&#x884C;&#x591A;&#x4E2A; HTTP &#x8BF7;&#x6C42;&#x3002;</p>
<pre class="language-"><code class="lang-javascript"><span class="token keyword">const</span> urls <span class="token operator">=</span> <span class="token punctuation">[</span>
    <span class="token string">&apos;https://api.example.com/users&apos;</span><span class="token punctuation">,</span>
    <span class="token string">&apos;https://api.example.com/orders&apos;</span><span class="token punctuation">,</span>
    <span class="token string">&apos;https://api.example.com/goods&apos;</span>
<span class="token punctuation">]</span><span class="token punctuation">;</span>
Promise<span class="token punctuation">.</span><span class="token function">all</span><span class="token punctuation">(</span>urls<span class="token punctuation">.</span><span class="token function">map</span><span class="token punctuation">(</span><span class="token parameter">url</span> <span class="token operator">=&gt;</span> <span class="token function">fetch</span><span class="token punctuation">(</span>url<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
    <span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token parameter">responses</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
        <span class="token keyword">return</span> Promise<span class="token punctuation">.</span><span class="token function">all</span><span class="token punctuation">(</span>
            responses<span class="token punctuation">.</span><span class="token function">map</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">response<span class="token punctuation">,</span> index</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
                <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>response<span class="token punctuation">.</span>ok<span class="token punctuation">)</span> <span class="token punctuation">{</span>
                    <span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">Error</span><span class="token punctuation">(</span><span class="token template-string"><span class="token template-punctuation string">`</span><span class="token string">Unsuccessful #</span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>index <span class="token operator">+</span> <span class="token number">1</span><span class="token interpolation-punctuation punctuation">}</span></span><span class="token string">.</span><span class="token template-punctuation string">`</span></span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                <span class="token punctuation">}</span>
                <span class="token keyword">return</span> response<span class="token punctuation">.</span><span class="token function">json</span><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>
        <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><span class="token function">then</span><span class="token punctuation">(</span><span class="token parameter">data</span> <span class="token operator">=&gt;</span> console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span><span class="token punctuation">)</span>
    <span class="token punctuation">.</span><span class="token function">catch</span><span class="token punctuation">(</span><span class="token parameter">error</span> <span class="token operator">=&gt;</span> console<span class="token punctuation">.</span><span class="token function">error</span><span class="token punctuation">(</span>error<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>
</code></pre>
<p>&#x6267;&#x884C;&#x4E0B;&#x9762;&#x7684;&#x4EE3;&#x7801;&#xFF0C;&#x901A;&#x8FC7;&#x51FD;&#x6570;&#x7684;&#x65B9;&#x5F0F;&#x6A21;&#x62DF;&#x5F02;&#x6B65;&#x7F16;&#x7A0B;&#x4E32;&#x884C;&#x6267;&#x884C;&#x591A;&#x4E2A;&#x64CD;&#x4F5C;&#x3002;</p>
<pre class="language-"><code class="lang-javascript"><span class="token keyword">function</span> <span class="token function">func1</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token function">fetch</span><span class="token punctuation">(</span><span class="token string">&apos;https://api.example.com/users&apos;</span><span class="token punctuation">)</span>
        <span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">response</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
            <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>response<span class="token punctuation">.</span>ok<span class="token punctuation">)</span> <span class="token punctuation">{</span>
                <span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">Error</span><span class="token punctuation">(</span><span class="token string">&apos;Unsuccessful #1.&apos;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span>
            <span class="token keyword">return</span> response<span class="token punctuation">.</span><span class="token function">json</span><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>
        <span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">data</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">.</span><span class="token function">catch</span><span class="token punctuation">(</span><span class="token parameter">error</span> <span class="token operator">=&gt;</span> console<span class="token punctuation">.</span><span class="token function">error</span><span class="token punctuation">(</span>error<span class="token punctuation">)</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">func2</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token function">fetch</span><span class="token punctuation">(</span><span class="token string">&apos;https://api.example.com/orders&apos;</span><span class="token punctuation">)</span>
        <span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">response</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
            <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>response<span class="token punctuation">.</span>ok<span class="token punctuation">)</span> <span class="token punctuation">{</span>
                <span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">Error</span><span class="token punctuation">(</span><span class="token string">&apos;Unsuccessful #2.&apos;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span>
            <span class="token keyword">return</span> response<span class="token punctuation">.</span><span class="token function">json</span><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>
        <span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">data</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">.</span><span class="token function">catch</span><span class="token punctuation">(</span><span class="token parameter">error</span> <span class="token operator">=&gt;</span> console<span class="token punctuation">.</span><span class="token function">error</span><span class="token punctuation">(</span>error<span class="token punctuation">)</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">func3</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token function">fetch</span><span class="token punctuation">(</span><span class="token string">&apos;https://api.example.com/goods&apos;</span><span class="token punctuation">)</span>
        <span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">response</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
            <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>response<span class="token punctuation">.</span>ok<span class="token punctuation">)</span> <span class="token punctuation">{</span>
                <span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">Error</span><span class="token punctuation">(</span><span class="token string">&apos;Unsuccessful #3.&apos;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span>
            <span class="token keyword">return</span> response<span class="token punctuation">.</span><span class="token function">json</span><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>
        <span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">data</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">.</span><span class="token function">catch</span><span class="token punctuation">(</span><span class="token parameter">error</span> <span class="token operator">=&gt;</span> console<span class="token punctuation">.</span><span class="token function">error</span><span class="token punctuation">(</span>error<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">async</span> <span class="token keyword">function</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">await</span> <span class="token function">func1</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">await</span> <span class="token function">func2</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">await</span> <span class="token function">func3</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token function">main</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;&#x901A;&#x8FC7;&#x51FD;&#x6570;&#x7684;&#x65B9;&#x5F0F;&#x6A21;&#x62DF;&#x5F02;&#x6B65;&#x7F16;&#x7A0B;&#x5E76;&#x884C;&#x6267;&#x884C;&#x591A;&#x4E2A;&#x64CD;&#x4F5C;&#x3002;</p>
<pre class="language-"><code class="lang-javascript"><span class="token keyword">function</span> <span class="token function">func1</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token function">fetch</span><span class="token punctuation">(</span><span class="token string">&apos;https://api.example.com/users&apos;</span><span class="token punctuation">)</span>
        <span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">response</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
            <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>response<span class="token punctuation">.</span>ok<span class="token punctuation">)</span> <span class="token punctuation">{</span>
                <span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">Error</span><span class="token punctuation">(</span><span class="token string">&apos;Unsuccessful #1.&apos;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span>
            <span class="token keyword">return</span> response<span class="token punctuation">.</span><span class="token function">json</span><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>
        <span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">data</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">.</span><span class="token function">catch</span><span class="token punctuation">(</span><span class="token parameter">error</span> <span class="token operator">=&gt;</span> console<span class="token punctuation">.</span><span class="token function">error</span><span class="token punctuation">(</span>error<span class="token punctuation">)</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">func2</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token function">fetch</span><span class="token punctuation">(</span><span class="token string">&apos;https://api.example.com/orders&apos;</span><span class="token punctuation">)</span>
        <span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">response</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
            <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>response<span class="token punctuation">.</span>ok<span class="token punctuation">)</span> <span class="token punctuation">{</span>
                <span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">Error</span><span class="token punctuation">(</span><span class="token string">&apos;Unsuccessful #2.&apos;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span>
            <span class="token keyword">return</span> response<span class="token punctuation">.</span><span class="token function">json</span><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>
        <span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">data</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">.</span><span class="token function">catch</span><span class="token punctuation">(</span><span class="token parameter">error</span> <span class="token operator">=&gt;</span> console<span class="token punctuation">.</span><span class="token function">error</span><span class="token punctuation">(</span>error<span class="token punctuation">)</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">func3</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token function">fetch</span><span class="token punctuation">(</span><span class="token string">&apos;https://api.example.com/goods&apos;</span><span class="token punctuation">)</span>
        <span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">response</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
            <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>response<span class="token punctuation">.</span>ok<span class="token punctuation">)</span> <span class="token punctuation">{</span>
                <span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">Error</span><span class="token punctuation">(</span><span class="token string">&apos;Unsuccessful #3.&apos;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span>
            <span class="token keyword">return</span> response<span class="token punctuation">.</span><span class="token function">json</span><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>
        <span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">data</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">.</span><span class="token function">catch</span><span class="token punctuation">(</span><span class="token parameter">error</span> <span class="token operator">=&gt;</span> console<span class="token punctuation">.</span><span class="token function">error</span><span class="token punctuation">(</span>error<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">async</span> <span class="token keyword">function</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">await</span> Promise<span class="token punctuation">.</span><span class="token function">all</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token function">func1</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token function">func2</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token function">func3</span><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>
<span class="token punctuation">}</span>
<span class="token function">main</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>

                                
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