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js工具库 封装常用的工具函数 如深拷贝 时间转换日期格式化、浏览器判断等，提高开发效率
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<h1 class="page-title">Source: judgement/index.js</h1>
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<pre class="prettyprint source linenums"><code>/*
* @Author: zhangyu
* @Email: zhangdulin@outlook.com
* @Date: 2021-06-22 10:40:09
* @LastEditors: zhangyu
* @LastEditTime: 2021-08-25 15:47:18
* @Description:
*/
import { trim } from '../transfer/regex'
//Node.js中闭包外部this并非global eg:(function(g){})(this); //this not global
//严格模式下this不指向全局变量
var GLOBAL = typeof global == "object" ? global : window,
toString = Object.prototype.toString,
has = Object.prototype.hasOwnProperty,
slice = Array.prototype.slice;
//严格模式与window识别检测
//2018/10/10: uglify压缩会导致此检测函数失效
//function detect_strict_mode() {
// var f = function (arg) {
// arguments[0] = 1;
// return arg != arguments[0];
// };
// return f(0);
//}
//默认严格模式,不再通过检测判断
var is_strict_mode = true, //detect_strict_mode(),
is_window_mode = GLOBAL == GLOBAL.window;
/**
* 获取数据类型(小写) undefined|null|string|number|array|function|date|regexp|window|node|list
* @param {object} obj 要检测的数据
* @return {string}
*/
export function getType(obj) {
if (obj == undefined) return "" + obj;
//内置函数,性能最好 (注意：safari querySelectorAll返回值类型为function)
if (typeof obj !== "object" && typeof obj !== "function") return typeof obj;
//非window模式(Node)下禁用以下检测
if (is_window_mode) {
if (typeof obj.nodeType === "number") return "node";
if (typeof obj.length === "number") {
//严格模式禁止使用 arguments.callee,调用会报错
//IE9+等使用 toString.call 会返回 [object Arguments],此为兼容低版本IE
//if (!is_strict_mode && obj.callee) return "arguments";
//IE9+等使用 toString.call 会返回 [object Window],此为兼容低版本IE
if (obj == obj.window) return "window";
//document.getElementsByTagName("*") => HTMLCollection
//document.querySelectorAll("*") => NodeList
//此处统一为 list
if (obj.item) return "list";
}
}
//在某些最新的浏览器中(IE11、Firefox、Chrome)性能与hash读取差不多 eg: return class2type[toString.call(obj)];
return toString.call(obj).slice(8, -1).toLowerCase();
}
// export function typeIs<T>(target: T): string {
// const Type: any = {
// '[object String]': 'string',
// '[object Number]': 'number',
// '[object Boolean]': 'boolean',
// '[object Symbol]': 'symbol',
// '[object Undefined]': 'undefined',
// '[object Null]': 'null',
// '[object Function]': 'function',
// '[object Date]': 'date',
// '[object Array]': 'array',
// '[object Object]': 'object',
// '[object Map]': 'map',
// '[object RegExp]': 'regexp',
// '[object Error]': 'error',
// '[object HTMLDocument]': 'document',
// '[object global]': 'window' // window 是全局对象 global 的引用
// }
// const find_proto: string = Object.prototype.toString.call(target)
// const type_to_string: string = Type[find_proto]
// return type_to_string
// }
/**
* 检测是否为函数
* @param {object} fn 要检测的数据
* @return {boolean}
*/
export function isFunc(fn) {
//在IE11兼容模式（ie6-8）下存在bug,当调用次数过多时可能返回不正确的结果
//return typeof fn == "function";
return toString.call(fn) === "[object Function]" || toString.call(fn) === "[object AsyncFunction]";
}
/**
* 检测是否为对象
* @param {object} obj 要检测的数据
* @return {boolean}
*/
export function isObject(obj) {
//typeof null => object
//toString.call(null) => [object Object]
return obj && toString.call(obj) === "[object Object]";
}
/**
* 检测是否为数组
* @param {object} obj 要检测的数据
* @return {boolean}
*/
export function isArray(obj) {
return toString.call(obj) === "[object Array]";
}
/**
* 检测是否为数组或类数组
* @param {object} obj 要检测的数据
* @return {boolean}
*/
export function isArrayLike(obj) {
var type = getType(obj);
return type == "array" || type == "list" || type == "arguments";
}
/**
* 若value不为undefine,则返回value;否则返回defValue
* @param {object} value
* @param {object} defValue value不存在时返回的值
* @return {*}
*/
export function def(value, defValue) {
return value !== undefined ? value : defValue;
}
/**
* @description: 判断对象是否相等
* @param {object} 对象
* @return {boolean}
*/
export const isDiff = (obj1, obj2) => {
var o1 = obj1 instanceof Object;
var o2 = obj2 instanceof Object;
if (!o1 || !o2) {
/* 判断不是对象 */
return obj1 === obj2;
}
if (Object.keys(obj1).length !== Object.keys(obj2).length) {
return false;
//Object.keys() 返回一个由对象的自身可枚举属性(key值)组成的数组,例如：数组返回下表：let arr = ["a", "b", "c"];console.log(Object.keys(arr))->0,1,2;
}
for (var attr in obj1) {
var t1 = obj1[attr] instanceof Object;
var t2 = obj2[attr] instanceof Object;
if (t1 && t2) {
return isDiff(obj1[attr], obj2[attr]);
} else if (obj1[attr] !== obj2[attr]) {
return false;
}
}
return true;
}
/**
* 检测是否是符合条件的数字(n必须为数字类型)
* @param {number} n 数字
* @param {number|undefined} min 允许的最小值
* @param {number|undefined} max 允许的最大值
* @param {number|undefined} max_decimal_len 最大小数位数
*/
export function isNum(n, min, max, max_decimal_len) {
if (typeof n != "number" || isNaN(n)) return false;
if (min != undefined && n < min) return false;
if (max != undefined && n > max) return false;
if (max_decimal_len) {
var l = ((n + '').split('.')[1] || '').length;
if (l > max_decimal_len) return false;
}
return true;
}
/**
* 检测是否为大于0的数字(n必须为数字类型)
* @param {number} n 数字
*/
export function isUNum(n) {
return !isNaN(n) && n > 0;
}
/**
* 检测是否为整数(n必须为数字类型)
* @param {number} n 数字
* @param {number|undefined} min 允许的最小值
* @param {number|undefined} max 允许的最大值
*/
export function isInt(n, min, max) {
return isNum(n, min, max) && n === Math.floor(n);
}
/**
* 检测是否为大于0的整数
* @param {number} n 数字
*/
export function isUInt(n) {
return isInt(n, 1);
}
/**
* 判断是否是符合条件的数字
* @param {string|number} str 要检测的字符串或数字
* @param {number|undefined} min 允许的最小值
* @param {number|undefined} max 允许的最大值
* @param {number|undefined} max_decimal_len 最大小数位数
*/
export function checkNum(str, min, max, max_decimal_len) {
if (typeof str == "number") return isNum(str, min, max, max_decimal_len);
if (typeof str == "string") {
str = str.trim();
return str && isNum(+str, min, max, max_decimal_len);
}
return false;
}
/**
* 判断是否是符合条件的整数
* @param {string|number} str 要检测的字符串或数字
* @param {number|undefined} min 允许的最小值
* @param {number|undefined} max 允许的最大值
*/
export function checkInt(str, min, max) {
if (typeof str == "number") return isInt(str, min, max);
if (typeof str == "string") {
str = str.trim();
return str && isInt(+str, min, max);
}
return false;
}
// 判断字符串是否可以转换对象
export const isJSONStringify = str => {
if (typeof str == 'string') {
try {
var obj = JSON.parse(str);
if (typeof obj == 'object' && obj) {
return true;
} else {
return false;
}
} catch (e) {
console.log('error：' + e + 'info' + str);
return false;
}
} else {
console.log('It is not a string!');
return false;
}
};
/**
* 判断Object array是否是空对象
* @param {any} target
*/
export function isObjEmpty(target) {
if (!['object', 'array'].includes(getType(target))) return false;
return ['{}', '[]'].includes(JSON.stringify(target));
}
/**
* 比较大小
* @returns -1 0 1
*/
export function compareSize(small, big){
let before, after;
before = isNum(small) ? +small : small
after = isNum(big) ? +big : big
if (before < after) return 1;
if (before === after) return 0;
return -1;
}
export default {
getType,
isArrayLike,
isArray,
isObject,
def,
isNum,
isUNum,
isFunc,
isInt,
isUInt,
checkNum,
checkInt,
isJSONStringify,
isDiff,
isObjEmpty,
compareSize
}</code></pre>
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