login_3error

                                                                      ↑

                                ↑错误返回

                                ↑

  提交答案        会员登陆   ↑  检查信息

home      →→   login_1  →→  login_2 →→  login_4success→返回

       check_4   ↓     check_1      check_2            ↑

                 ↓                                     ↑

            注册 ↓                                     ↑

      ↓                注册                 ↑ 

       →→  register  →→  login_22   →→ 

                 ↑    check_3        ↓ check_22

          错误返回  ↑      ↓           ↓

           ↑      ↓           ↓错误返回

                                                 ←  ←                     login_3error   


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