JavaScript splice() 方法

定义和用法

splice() 方法向/从数组中添加/删除项目,然后返回被删除的项目。

注释:该方法会改变原始数组。

例子 1

在本例中,我们将创建一个新数组,并向其添加一个元素:

<script type="text/javascript">

var arr = new Array(6)
arr[0] = "George"
arr[1] = "John"
arr[2] = "Thomas"
arr[3] = "James"
arr[4] = "Adrew"
arr[5] = "Martin"

document.write(arr + "<br />")
arr.splice(2,0,"William")
document.write(arr + "<br />")

</script>

输出:

George,John,Thomas,James,Adrew,Martin
George,John,William,Thomas,James,Adrew,Martin

例子 2

在本例中我们将删除位于 index 2 的元素,并添加一个新元素来替代被删除的元素:

<script type="text/javascript">

var arr = new Array(6)
arr[0] = "George"
arr[1] = "John"
arr[2] = "Thomas"
arr[3] = "James"
arr[4] = "Adrew"
arr[5] = "Martin"

document.write(arr + "<br />")
arr.splice(2,1,"William")
document.write(arr)

</script>

输出:

George,John,Thomas,James,Adrew,Martin
George,John,William,James,Adrew,Martin

例子 3

在本例中我们将删除从 index 2 ("Thomas") 开始的三个元素,并添加一个新元素 ("William") 来替代被删除的元素:

<script type="text/javascript">

var arr = new Array(6)
arr[0] = "George"
arr[1] = "John"
arr[2] = "Thomas"
arr[3] = "James"
arr[4] = "Adrew"
arr[5] = "Martin"

document.write(arr + "<br />")
arr.splice(2,3,"William")
document.write(arr)

</script>

输出:

George,John,Thomas,James,Adrew,Martin
George,John,William,Martin

posted on 2016-08-17 15:38  dataman  阅读(190)  评论(0编辑  收藏  举报

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