怎样拷贝数组（深/浅拷贝）怎样拷贝数组（深

拷贝数组就是把原来数组的每一项保存在一个新数组中，这样在操作数组的同时，另一个数组就不会受影响，因为数组是引用类型的值，所以在拷贝数组的同时并不能直接复制变量值，我们有一下几种方法可以使用。
循环

var ary1 = [1,2,3]; for (var i = 0, ary2 = Array(ary1.length); i < ary1.length; i++) ary2[i] = ary1[i];

slice

var ary1 = [1,2,3]; var ary2 = ary1.slice();

运算符

var ary1 = [1,2,3]; var ary2 = [...ary1];

from

var ary1 = [1,2,3]; var ary2 = Array.from(ary1);

concat

var ary1 = [1,2,3]; var ary2 = [].concat(ary1);

说到深拷贝，比较特殊的就是数组和对象了，所以在编写方法的时候要分别做不同的处理，代码如下：

let ary = [1,[2, {name: "张三"}]]; function copyAry(options) { return copy(options) }function copy(ary) { let newAry = [] for (const item of ary) { let value = https://www.it610.com/article/item; if (Object.prototype.toString.call(value) ==="[object Object]") value = https://www.it610.com/article/copyObj(value); if (Object.prototype.toString.call(value) ==="[object Array]") value = https://www.it610.com/article/copyAry(value); newAry.push(value); } return newAry; }function copyObj(obj) { let newObj = {}; for (const key in obj) { let value = obj[key]; if (Object.prototype.toString.call(value) ==="[object Object]") value = https://www.it610.com/article/copyObj(value); if (Object.prototype.toString.call(value) ==="[object Array]") value = https://www.it610.com/article/copyAry(value); newObj[key] = value; } return newObj; }// 测试 let newAry = copyAry(ary); ary[1][1].name="李四" console.log(newAry[1][1].name) //张三 console.log(ary[1][1].name) //李四

【怎样拷贝数组（深/浅拷贝）】查看作者源码