js如何从数组里面随机获取1个或多个数字

js如何从数组里面随机获取1个或多个数字

//jquery随机数字
var arr = ['xas2232','xas2210','xas2209',];
//输出数组
var out = [];
//输出个数
var num = 1;
while(out.length < num){
    var temp = (Math.random()*arr.length) >> 0;
    out.push(arr.splice(temp,1));
}
alert(out)