添加“24.两两交换链表中的节点”Javascript版本

problems/0024.两两交换链表中的节点.md

@@ -132,6 +132,21 @@ Python：
 
 Go：
 
+Javascript:
+```javascript
+var swapPairs = function (head) {
+  let ret = new ListNode(0, head), temp = ret;
+  while (temp.next && temp.next.next) {
+    let cur = temp.next.next, pre = temp.next;
+    pre.next = cur.next;
+    cur.next = pre;
+    temp.next = cur;
+    temp = pre;
+  }
+  return ret.next;
+};
+```
+
 
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 * 作者微信：[程序员Carl](https://mp.weixin.qq.com/s/b66DFkOp8OOxdZC_xLZxfw)