diff --git a/1.bubbleSort.md b/1.bubbleSort.md
index e73bce5..d4bd1f6 100644
--- a/1.bubbleSort.md
+++ b/1.bubbleSort.md
@@ -36,8 +36,8 @@
 ```js
 function bubbleSort(arr) {
     var len = arr.length;
-    for (var i = 0; i < len; i++) {
-        for (var j = 0; j < len - 1 - i; j++) {
+    for (var i = len - 1; i > 0; --i) {
+        for (var j = 0; j < i; ++j) {
             if (arr[j] > arr[j+1]) {        // 相邻元素两两对比
                 var temp = arr[j+1];        // 元素交换
                 arr[j+1] = arr[j];
@@ -49,14 +49,12 @@ function bubbleSort(arr) {
 }
 ```
 
-
-
 ## 6. Python 代码实现
 
 ```python
 def bubbleSort(arr):
-    for i in range(1, len(arr)):
-        for j in range(0, len(arr)-i):
+    for i in range(len(arr)-1, 0, -1):
+        for j in range(0, i):
             if arr[j] > arr[j+1]:
                 arr[j], arr[j + 1] = arr[j + 1], arr[j]
     return arr