ES5 方法总结

1.slice

let arr = [2,4,434,43]let arr1= arr.slice()arr[0] = 'a'console.log(arr,arr1) // [ 2, 4, 434, 43 ]console.log(arr1 === arr) // false

2. 遍历数组

Array.prototype.clone = function(){    let a=[];    for(let i=0,l=this.length;i

3. concat()

Array.prototype.clone=function(){     return [].concat(this);     //或者 return this.concat();}let arr = ['aaa','asss']let arr1 = arr.clone()arr[0] = 123console.log(arr,arr1)

ES6 方法总结

1. Object.assign() 浅复制，也可以实现数组的克隆

let arr = ['sdsd',123,123,123]let arr1 = []Object.assign(arr1,arr)arr[1] = 'aaaa'console.log(arr,arr1) // [ 'sdsd', 'aaaa', 123, 123 ] [ 'sdsd', 123, 123, 123 ]

 2. 扩展运算符

const a1 = [1, 2];// 写法一const a2 = [...a1];a1[0] = 'aaa'console.log(a1,a2)