javascript将数组插入到另一个数组中的代码

将数组arr2插入到数组arr1的index位置：
复制代码代码如下:
var arr1 = ["a", "b", "c"];
var arr2 = ["1", "2", "3"];
var index = 1;
arr2.unshift（index, 0）;Array.prototype.splice.apply（arr1, arr2）;
console.log（arr1）;

显示结果：
复制代码代码如下:
["a", "1", "2", "3", "b", "c"]