//从第三个位置开始，删除2项$(document).ready(function(){	var arr  = [1,2,3,4,5,6,7,8,9,10];	arr.splice(3,2);	console.log(arr);});//从第一个位置，添加2项，即数组最前端加55和66var arr1  = [1,2,3,4,5,6,7,8,9,10];arr1.splice(0,0,55,66);console.log(arr1);//从第一个位置，删除一项，添加2项var arr2  = [1,2,3,4,5,6,7,8,9,10];arr2.splice(0,1,55,66);console.log(arr2);

　　代码片断清楚的说明了2个参数及2+个参数的用法