如何将项目插入到特定索引处的数组中(JavaScript)

织梦狗教程前端问题

2022-01-01

How to insert an item into an array at a specific index (JavaScript)(如何将项目插入到特定索引处的数组中(JavaScript))

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问题描述

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

arr.insert(index, item)

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

解决方案

You want the splice function on the native array object.

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).

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

js" data-hide="false" data-console="true" data-babel="false">

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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