tp框架的ajax验证用户姓名的比较

数据库设计随意设计吧 反正就是用户可以存入就可以了！

正文tp后台方法简化：

 //用户验证    function checknm($name){        $info = D('user')->where("user_name ='$name'")->find();        //dump($info);die;        $flag = '';        if($info){           echo 1;                  }else{           echo 2;                 }    }

后台返回1和2

前端ajax部分 用data接收1和2的状态

当然data的接收 主要看你后台传的是什么格式的数据类型了！这个大家可以百度ajax了！

<div class="usBox">                     <div class="usBox_2 clearfix">                         <div class="logtitle3"></div>                         <form id="yw0" action="" method="post">                         <style>                          .msg{color:gray;}                          .msg2{color:#ff3333;}                         </style>                          <table cellpadding="5" cellspacing="3" >                                 <tbody>                                 <script type="text/javascript" src="__PUBLIC__/js/jquery-1.8.3.min.js"></script>                                  <script type="text/javascript">                                                                 function checkname(){                                         var name = document.getElementById('User_username').value;                                                                              $.get('/tpTest/index.php/User/checknm',{name:name},function(data){                                             //alert(name);                                          if(data == 1){                                            var nm = document.getElementById('span1');                                            nm.innerHTML='用户名存在';                                            nm.className ="msg2";                                          }                                          if(data == 2){                                          var nm = document.getElementById('span1');                                            nm.innerHTML='用户可以使用';                                            nm.className ="msg";                                                                                    }                                         })                                                                 }                                                                          </script>                                     <tr>                                         <td >                                         <label for="User_username" class="required">用户名                                          </label>                                         </td>                                         <td >                                             <input class="inputBg" size="25" name="User[username]" id="User_username" type="text" value=""  onblur = "checkname()"/>                                                               <span id="span1" class="msg"></span>                                         </td>                                     </tr>