continue :return true; break :return false; 也可以利用return即可跳出jQuery
来源：http://bie.xiaowangge.info/browse.php?u=fcfa8e35309f9Oi8va2V2eXUuYmxvZ3Nwb3QuanAvMjAwOC8wNi9qcXVlcnllYWNoLmh0bWw%3D&b=13
