深度优先和广度优先

参考链接：

http://rapheal.iteye.com/blog/1526863

https://segmentfault.com/a/1190000002685939

http://m.blog.csdn.net/article/details?id=44992839 

js实现深度和广度优先

http://www.jb51.net/article/81156.htm

 

js非递归实现遍历

http://www.html-js.com/article/2966