如何在特定索引处将项目插入数组 (JavaScript) [英] How to insert an item into an array at a specific index (JavaScript)

问题描述

我正在寻找一种 JavaScript 数组插入方法，样式如下:

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

arr.insert(index, item)

最好使用 jQuery，但此时任何 JavaScript 实现都可以.

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

推荐答案

您想要 splice 对原生数组对象的函数.

You want the splice function on the native array object.

arr.splice(index, 0, item); 将item 插入到arr 中指定的index>(先删除0项，即只是插入).

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).

在这个例子中，我们将创建一个数组并将一个元素添加到索引 2 中:

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

var arr = [];
arr[0] = "Jani";
arr[1] = "Hege";
arr[2] = "Stale";
arr[3] = "Kai Jim";
arr[4] = "Borge";

console.log(arr.join()); // Jani,Hege,Stale,Kai Jim,Borge
arr.splice(2, 0, "Lene");
console.log(arr.join()); // Jani,Hege,Lene,Stale,Kai Jim,Borge

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