Array.prototype.splice.apply合并数组用法详解

Array.prototype.splice.apply合并数组用法详解数组对象的splice方法合并数组Array.prototype.splice.apply合并数组数组对象的splice方法合并数组var arr1 = ['a', 'b', 'c'];arr1.splice(2, 0, '1');arr1.splice(2, 0, '2')arr1.splice(2, 0, '3')cons

美兮，乐兮

2378人浏览 · 2020-08-21 17:00:02

美兮，乐兮 · 2020-08-21 17:00:02 发布

数组对象的splice方法合并数组

var arr1 = ['a', 'b', 'c']; 
arr1.splice(2, 0, '1');
arr1.splice(2, 0, '2')
arr1.splice(2, 0, '3')
console.log(arr1);

运行结果：
在这里插入图片描述

Array.prototype.splice.apply合并数组

var arr1 = ['a', 'b', 'c']; 
var arr2 = ['1', '2', '3']; 
//合并数组arr1和arr2
arr2.unshift(2, 0); //在arr2前面插入两个元素2和0；arr2 = [2, 0, '1', '2', '3'];
//2和0的含义是从arr1的索引为2的元素前面删掉0个元素后，再往索引为2的元素前插入arr2的元素
Array.prototype.splice.apply(arr1, arr2); 
console.log(arr1); //[ 'a', 'b', '1', '2', '3', 'c' ]