diff --git a/problems/剑指Offer05.替换空格.md b/problems/剑指Offer05.替换空格.md
index 49c2c223..3e4e3631 100644
--- a/problems/剑指Offer05.替换空格.md
+++ b/problems/剑指Offer05.替换空格.md
@@ -245,6 +245,45 @@ class Solution(object):
 ```
 
 
+javaScript:
+```js
+/**
+ * @param {string} s
+ * @return {string}
+ */
+ var replaceSpace = function(s) {
+   // 字符串转为数组
+  const strArr = Array.from(s);
+  let count = 0;
+
+  // 计算空格数量
+  for(let i = 0; i < strArr.length; i++) {
+    if (strArr[i] === ' ') {
+      count++;
+    }
+  }
+
+  let left = strArr.length - 1;
+  let right = strArr.length + count * 2 - 1;
+
+  while(left >= 0) {
+    if (strArr[left] === ' ') {
+      strArr[right--] = '0';
+      strArr[right--] = '2';
+      strArr[right--] = '%';
+      left--;
+    } else {
+      strArr[right--] = strArr[left--];
+    }
+  }
+
+  // 数组转字符串
+  return strArr.join('');
+};
+```
+
+
+
 -----------------------
 * 作者微信：[程序员Carl](https://mp.weixin.qq.com/s/b66DFkOp8OOxdZC_xLZxfw)
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