我自己常用的几个JS深浅拷贝的方法

案例代码

let obj = [
	{
		name: 'robin',
		age: 24,
		num: [
			{
				sleep: '8',
				eat: 'chicked',
				happy: [1,2,3]
			}
		]
	}		
]

深拷贝

1. JSON

let newObj = JSON.parse(JSON.stringify(obj))

2. jQuery的$.extend()

let o = {}
let newObj = $.extend(true, o, obj)

3. 函数库lodash里面的closeDeep方法
4. 递归拷贝

		function deepClone (sourceObj, targetObj) {
		    let cloneObj = targetObj || {}
		    if(!sourceObj || typeof sourceObj !== "object" || sourceObj.length === undefined){
		        return sourceObj
		    }
		    if(sourceObj instanceof Array){
		        cloneObj = sourceObj.concat() // concat 不会改变原有数组，会返回原有数组的一个副本
		    } else {
		        for(let i in sourceObj){
		            if (typeof sourceObj[i] === 'object') {
		                cloneObj[i] = deepClone(sourceObj[i], {})
		            } else {
		                cloneObj[i] = sourceObj[i]
		            }
		        }
		    }
		    return cloneObj
		}

浅拷贝

1. Object.create()
2. Object.assign()
3. 引用赋值