LeetCode Javascript实现 100. Same Tree 171. Excel Sheet Column Number

/**
 * 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(q===null&&p!==null){
        return false;
    }
    if(p.val!==q.val){
        return false;
    }
    if(isSameTree(p.left,q.left)&& isSameTree(p.right,q.right)){
    return true;
    }
    else{
       return false;
    }
    
};

/**
 * @param {string} s
 * @return {number}
 */
var titleToNumber = function(s) {
     var sl = s.length;
     var sc,result=0,i=0;
     while(sl!==0){
        sc = s.charAt(sl-1);
        result = (sc.charCodeAt()-64)*Math.pow(26,i)+result;
        sl--;
        i++;
     }
     return result;
};