javascript - 如何在特定索引（JavaScript）的数组中插入项目？(How to insert an item into an array at a specific index (JavaScript)?)

Question

I am looking for a JavaScript array insert method, in the style of:

(我正在寻找一种JavaScript数组插入方法，其样式为：)

arr.insert(index, item)

Preferably in jQuery, but any JavaScript implementation will do at this point.

(最好是在jQuery中，但此时任何JavaScript实现都可以。)

  ask by tags2k translate from so

Answer 1

What you want is the splice function on the native array object.

(您想要的是本机数组对象上的splice函数。)

arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert).

(将在指定索引处将item插入到arr中（首先删除0项目，也就是说，它只是一个插入）。)

In this example we will create an array and add an element to it into index 2:

(在此示例中，我们将创建一个数组并将一个元素添加到索引2中：)

 var arr = []; arr[0] = "Jani"; arr[1] = "Hege"; arr[2] = "Stale"; arr[3] = "Kai Jim"; arr[4] = "Borge"; console.log(arr.join()); arr.splice(2, 0, "Lene"); console.log(arr.join());