Detailed explanation of js disrupting the order of arrays

    //方法一：也是最简单的方法
    var arr=[];    for(var i=0;i<100;i++){
            arr[i]=i;
        }
    arr.sort(function(){ return 0.5 - Math.random() })    var str=arr.join();
    alert(str);

//方法二： Fisher–Yates洗牌算法var arr = new Array(1,2,3,5);Array.prototype.shuffle = function() {
    var array = this;    var m = array.length,
        t, i;    while (m) {
        i = Math.floor(Math.random() * m--);
        t = array[m];        array[m] = array[i];        array[i] = t;
    }    return array;
}
arr.shuffle()