//splice()方法
//插入项，插入时指定3个参数：起始位置、0(要删除的项)、要插入的项
var colors = ["red","green","blue"];
var inserted = colors.splice(1,0,"yellow","orange"); //从位置1开始插入两项
alert(colors); //red,yellow,orange,green,blue
alert(inserted); //空数组
//替换项，删除时指定3个参数：起始位置、要删除的项、要插入的任意项
var colors = ["red","green","blue"];
var replaced = colors.splice(1,1,"black","brown"); //删除一项，插入两项
alert(colors); //red,black,browm,blue
alert(replaced); //green
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