添加 344.反转字符串 JavaScript版本

problems/0344.反转字符串.md

@@ -183,6 +183,26 @@ func reverseString(s []byte)  {
 }
 ```
 
+javaScript:
+
+```js
+/**
+ * @param {character[]} s
+ * @return {void} Do not return anything, modify s in-place instead.
+ */
+var reverseString = function(s) {
+    return s.reverse();
+};
+
+var reverseString = function(s) {
+    let l = -1, r = s.length;
+    while(++l < --r) [s[l], s[r]] = [s[r], s[l]];
+    return s;
+};
+```
+
+
+