Javascript中用splice()来删除数组中的元素

一、splice()的用法 
arrayObject.splice(index,howmany,element1,.....,elementX)

Parameter
参数 Description
描述 
index Required. Specify where to add/remove elements. Must be a number
必选项。指定在哪个位置加入/删除元素，必须是数字 
howmany Required Specify how many elements should be removed. Must be a number, but can be "0"
必选项。指定有多少元素应该被删除。必须是数字，可以是"0" 
element1 Optional. Specify a new element to add to the array
可选。指定要加入到数组中的新元素 
elementX Optional. Several elements can be added
可选。可以加入多个元素

Example
举例In this example we will create an array and add an element to it:
在这个举例中我们将建立一个数组并为它加入一个元素：

<script type="text/javascript">
var arr = new Array(5)
arr[0] = "Jani"
arr[1] = "Hege"
arr[2] = "Stale"
arr[3] = "Kai Jim"
arr[4] = "Borge"
document.write(arr + "<br />")
arr.splice(2,0,"Lene")
document.write(arr + "<br />")
</script>

The output of the code above will be:
输出结果为：

Jani,Hege,Stale,Kai Jim,Borge
Jani,Hege,Lene,Stale,Kai Jim,Borge


--------------------------------------------------------------------------------
Example
举例In this example we will remove the element at index 2 ("Stale"), and add a new element ("Tove") there instead:
这个举例中我们将删除数组中index值为2的元素("Stale")，并在这个位置加上新的元素("Tove")：

<script type="text/javascript">
var arr = new Array(5)
arr[0] = "Jani"
arr[1] = "Hege"
arr[2] = "Stale"
arr[3] = "Kai Jim"
arr[4] = "Borge"
document.write(arr + "<br />")
arr.splice(2,1,"Tove")
document.write(arr)
</script>

The output of the code above will be:
输出结果为：

Jani,Hege,Stale,Kai Jim,Borge
Jani,Hege,Tove,Kai Jim,Borge


--------------------------------------------------------------------------------
Example
举例In this example we will remove three elements starting at index 2 ("Stale"), and add a new element ("Tove") there instead:
在这个举例中我们将会从index值为2的位置删除三个元素("Stale"开始)，并在这个位置加上一个新的元素("Tove"):

<script type="text/javascript">
var arr = new Array(5)
arr[0] = "Jani"
arr[1] = "Hege"
arr[2] = "Stale"
arr[3] = "Kai Jim"
arr[4] = "Borge"
document.write(arr + "<br />")
arr.splice(2,3,"Tove")
document.write(arr)
</script>

The output of the code above will be:
输出结果为：

Jani,Hege,Stale,Kai Jim,BorgeJani,Hege,Tove


二、删除数组的要素
如果是最后一个要素，直接   aobject.splice(aobject.length-1,1)
知道要素下标N   aobject.splice(N,1)
知道要素内容，需要for循环获得的下标，再删除