失去焦点显示是否用户名存在

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script src="../jquery-1.11.2.min.js"></script>
<title>无标题文档</title>
</head>

<body>
<input type="text"  id="uid"/>
<span id="ts"></span>

</body>
<script type="text/javascript">
$("#uid").blur(function(){
    var uid=$("#uid").val();
    $.ajax({
          url:"uidchuli.php",
          data:{n:uid},
          type:"POST",
          dataType:"TEXT",
          success:function(data){
              
                 if(data>0)
                 {
                     $("#ts").html("该用户已存在");
                     $("#ts").css("color","red")
                 }
                 else
                 {
                     $("#ts").html("该用户名可用");
                     $("#ts").css("color","green");
                     
                     }
              
              }
        
        })
    
    
    
    
    })
</script>
</html>

<?php
$uid=$_POST["n"];
include("../DBDA.class.php");
$db=new DBDA();
$sql="select count(*) from info where Name = '{$uid}'";
echo $db->StrQuery($sql);

失去焦点 显示是否用户名存在

失去焦点显示是否用户名存在