function BubbleSort(arr) {
    var arry = arr;
    var temp, isSort;
    for (var i = 0; i < arry.length - 1; i++) {    //进行n-1趟冒泡   
        isSort = true;
        for (var j = arry.length - 1; j > i; j--) {    //进行n-i次比较   
            if (arry[j][0] < arry[j - 1][0]) {
                temp = arry[j - 1];
                arry[j - 1] = arry[j];
                arry[j] = temp;
                isSort = false;   //设置退出标识位   
            }
        }
        if (isSort) break;
    }
    return arry;
}