如何将项目插入到特定索引(JavaScript)的数组中?
问题描述：
我正在寻找一种JavaScript数组插入方法，其样式为:
I am looking for a JavaScript array insert method, in the style of:
arr.insert(index, item)
最好在jQuery中使用，但是任何JavaScript实现都可以在这一点上完成.
Preferably in jQuery, but any JavaScript implementation will do at this point.
答
您想要的是 arr.splice(index, 0, item);将在指定的索引处将item插入到arr中(首先删除0个项目，也就是说，它只是一个插入).
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).
在此示例中，我们将创建一个数组并将元素添加到索引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());
arr.splice(2, 0, "Lene");
console.log(arr.join());