添加19.删除链表的倒数第N个节点javascript版本

problems/0019.删除链表的倒数第N个节点.md

@@ -135,6 +135,28 @@ func removeNthFromEnd(head *ListNode, n int) *ListNode {
 }
 ```
 
+JavaScript:
+
+```js
+/**
+ * @param {ListNode} head
+ * @param {number} n
+ * @return {ListNode}
+ */
+var removeNthFromEnd = function(head, n) {
+    let ret = new ListNode(0, head),
+        slow = fast = ret;
+    while(n--) fast = fast.next;
+    if(!fast) return ret.next;
+    while (fast.next) {
+        fast = fast.next; 
+        slow = slow.next
+    };
+    slow.next = slow.next.next;
+    return ret.next;
+};
+```
+
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