http://blog.chukong-inc.com/index.php/2012/02/14/%E5%88%A9%E7%94%A8tea%E7%AE%97%E6%B3%95%E8%BF%9B%E8%A1%8C%E6%95%B0%E6%8D%AE%E5%8A%A0%E5%AF%86/#codesyntax_1