周期:http://www.cnblogs.com/lwbqqyumidi/p/3769113.html
周期:http://www.oschina.net/question/54100_27841
创建及跳转:http://www.cnblogs.com/ludashi/p/4821160.html
创建及跳转:http://www.jianshu.com/p/240149838be7
原文:http://www.cnblogs.com/insist8089/p/7142066.html