[LeetCode][JavaScript]Generate Parentheses

 1 /**
 2  * @param {number} n
 3  * @return {string[]}
 4  */
 5 var generateParenthesis = function(n) { 
 6     var res = [];
 7     bfs("", 0, 0);
 8     return res;
 9 
10     function bfs(tmpStr, countL, countR){
11         if(countL === n && countR === n){
12             res.push(tmpStr);
13             return;
14         }
15         if(countL !== n ){
16             bfs(tmpStr + "(", countL + 1, countR);
17         }
18         if(countL > countR){
19             bfs(tmpStr + ")", countL, countR + 1);
20         }
21     }
22 };