打乱随机数算法很多，不过看这个还挺简便的，记录下来。
function shuffle(a) { var len = a.length; for(var i=0;i<len;i++){ var end = len - 1 ; var index = (Math.random()*(end + 1)) >> 0; var t = a[end]; a[end] = a[index]; a[index] = t; } return a; }; var arr = ["10","J","Q","K","A","2","3","4"]; shuffle(arr); // ["10", "J", "K", "Q", "4", "3", "A", "2"] 为随机数组
大概思路就是 循环的把数组最后一项和随机的那一项调换位置，得出的就是一组随机的新数组，比较简单
转载于:https://www.cnblogs.com/bfc0517/p/8670149.html
