数组的浅/深拷贝
2021-02-05 12:18
标签：方式 length var new 副本 lda col slice color 改变其中一个另外一个也会变化 直接赋值，var newArr = this.oldArr 改变其中一个数组另一个数组不会变化 1.for循环方式 2.concat方法，连接两个数组，不会改变原始数组，返回一个副本 3.slice方法，截取数组， 4.ES6扩展运算符实现数组的深拷贝 数组的浅/深拷贝 标签：方式 length var new 副本 lda col slice color 原文地址：https://www.cnblogs.com/zhaohui-116/p/12788738.html数组的浅拷贝
数组的深拷贝
var arr1 = [1, 2, 3];
var arr2 = [];
for (var i = 0; i ) {
arr2.push(arr1[i]);
}
arr1[0] = 4;
console.log(arr1); //4, 2, 3
console.log(arr2); //1, 2, 3
var arr1 = [1, 2, 3];
var arr2 = arr1.concat();
arr1[0] = 4;
console.log(arr1); //4, 2, 3
console.log(arr2); //1, 2, 3
var arr1 = [1, 2, 3];
var arr2 = arr1.slice(0);
arr1[0] = 4;
console.log(arr1); //4, 2, 3
console.log(arr2); //1, 2, 3
var arr1 = [1, 2, 3];
var [...arr2] = arr1;
arr1[0] = 4;
console.log(arr1); //4, 2, 3
console.log(arr2); //1, 2,