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function bubblesort(arr) {
   // sanity check

   // ==> 外层循环控制的是比较的次数
 for (let i = 0; i < arr.length - 1; i++) {
     // 里层循环控制每一轮比较的次数
     for (let j = 0; j < arr.length - i - 1; j++) {
        if (arr[j] > arr[j + 1]) {
           swap(arr, j, j + 1);
        }
     }

 }
 return arr;
}

function swap(arr, i, j) {
   let tmp = arr[i];
   arr[i] = arr[j];
   arr[j] = tmp;
}

var ary = [12, 13, 23, 14, 17, 11];
console.log(bubblesort(ary));