提供Javascript版本的《二叉搜索数的最近公共祖先》

problems/0235.二叉搜索树的最近公共祖先.md

@@ -314,7 +314,62 @@ func lowestCommonAncestor(root, p, q *TreeNode) *TreeNode {
 ```
 
 
+JavaScript版本
+> 递归
 
+```javascript
+/**
+ * Definition for a binary tree node.
+ * function TreeNode(val) {
+ *     this.val = val;
+ *     this.left = this.right = null;
+ * }
+ */
+
+/**
+ * @param {TreeNode} root
+ * @param {TreeNode} p
+ * @param {TreeNode} q
+ * @return {TreeNode}
+ */
+var lowestCommonAncestor = function(root, p, q) {
+    if(root.val > p.val && root.val > q.val)
+        return lowestCommonAncestor(root.left, p , q);
+    else if(root.val < p.val && root.val < q.val) 
+        return lowestCommonAncestor(root.right, p , q);
+    return root;
+};
+```
+
+> 迭代
+
+```javascript
+/**
+ * Definition for a binary tree node.
+ * function TreeNode(val) {
+ *     this.val = val;
+ *     this.left = this.right = null;
+ * }
+ */
+
+/**
+ * @param {TreeNode} root
+ * @param {TreeNode} p
+ * @param {TreeNode} q
+ * @return {TreeNode}
+ */
+var lowestCommonAncestor = function(root, p, q) {
+    while(1) {
+        if(root.val > p.val && root.val > q.val)
+            root = root.left;
+        else if(root.val < p.val && root.val < q.val)
+            root = root.right;
+        else
+            break;
+    }
+    return root;
+};
+```
 
 
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