js的数组处理函数splice

//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66
var 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);