内容参考来源

splice方法

splice() 方法向/从数组中添加/删除项目，然后返回被删除的项目。

//在数组指定位置插入
var fruits = ["Banana", "Orange", "Apple", "Mango"];
fruits.splice(2, 0, "Lemon", "Kiwi");
//输出结果
//Banana, Orange, Lemon, Kiwi, Apple, Mango
 
 
//在数组开头插入
var shuiguo = ["Banana", "Orange", "Apple", "Mango"];
shuiguo.splice(0, 0, "Lemon");
//输出结果
//Lemon, Banana, Orange, Apple, Mango

语法

array.splice(index,howmany,item1,.....,itemX)