JS数组之splice函数

arrayObject.splice(index,howmany,item1,item2......itemx);   //然后返回被删除的项目

index为添加/删除项目的位置。必须

howmany要删除的项目数量，必须，0为不删除

item1,..itemx为向数组添加的新项目。

<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>

George,John,Thomas,James,Adrew,MartinGeorge,John,William,Thomas,James,Adrew,Martin如果为arr.splice(2,1,"william"),则为

George,John,Thomas,James,Adrew,MartinGeorge,John,William,James,Adrew,Martin如果为
arr.splice(2,3,"William")
则为

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

注：push() 方法可向数组的末尾添加一个或多个元素，并返回新的长度。