javascript冒泡排序

function BubbleSort (arr) {    for (var i = 0; i < arr.length - 0; i++) {        for (var j = 0; j < arr.length - 1 - i; j++) {            if (arr[j] < arr[j+1]) { //如果正序就就改变符号                var temp = arr[j];                arr[j] = arr[j+1];                arr[j+1] = temp;            }        }    }}var num = [20,32,43,21,90,8,3,12,36];BubbleSort(num);for (var i = 0; i < num.length; i++) {    document.write(num[i] + '<br/>');};