题解 | #从上往下打印二叉树#
二叉树的深度
http://www.nowcoder.com/practice/435fb86331474282a3499955f0a41e8b
```/* function TreeNode(x) {
this.val = x;
this.left = null;
this.right = null;
} */
function TreeDepth(pRoot)
{
// write code here
//递归本质是DFS后序遍历，递归终止条件：该节点没有子节点了 返回值：当前节点深度
if(pRoot == null) {return 0}
let left = TreeDepth(pRoot.left)
let right = TreeDepth(pRoot.right)
return left>right?left+1:right+1
}
module.exports = {
TreeDepth : TreeDepth
};
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