Create 876.链表的中间结点.js

Author: yinxin630

876.链表的中间结点.js

@@ -0,0 +1,26 @@
+/**
+ * Definition for singly-linked list.
+ * function ListNode(val) {
+ *     this.val = val;
+ *     this.next = null;
+ * }
+ */
+/**
+ * @param {ListNode} head
+ * @return {ListNode}
+ */
+var middleNode = function(head) {
+    let length = 0;
+    for (let t = head; t;) {
+        length++;
+        t = t.next;
+    }
+
+    length = length >> 1; 
+    let result = head;
+    while (length > 0) {
+        result = result.next;
+        length--;
+    }
+    return result;
+};