# 相同的树

给定两个二叉树，编写一个函数来检验它们是否相同。

如果两个树在结构上相同，并且节点具有相同的值，则认为它们是相同的。<br>

```javascript
/**
 * Definition for a binary tree node.
 * function TreeNode(val) {
 *     this.val = val;
 *     this.left = this.right = null;
 * }
 */
/**
 * @param {TreeNode} p
 * @param {TreeNode} q
 * @return {boolean}
 */
var isSameTree = function(p, q) {
    if(p == null && q == null) 
        return true;
    if(p == null || q == null) 
        return false;
    if(p.val != q.val) 
        return false;
    return isSameTree(p.left, q.left) && isSameTree(p.right, q.right);
};
```


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