php jquery ajax

1.php文件如下 <?php header( ' Content-Type:text/html;charset=utf-8 '); ?>    <script type= " text/javascript "src= " http://code.jquery.com/jquery.min.js "></script> <scripttype= " text/javascript "> $(function() {     $( " #subbtn ").click(function() {          var  params = $( ' input ').serialize();          var url =  " 你的服务器端 php ";            $.ajax({             type:  " post ",             url: url,             dataType:  " json ",             data:  params,             success: function(msg){                  var tishi =  " 您提交的姓名为： " + msg.name +                  " <br/> 您提交的密码为： " + msg.password;                 $( " #tishi ").html(tishi);                 $( " #tishi ").css({color:  " green "});             }         });     });    });    </script> <p><labelfor= " name ">姓名：</label> <inputid= " name "name= " name "type= " text "/> </p>    <p><labelfor= " password ">密码：</label> <inputid= " password "name= " password "type= " password "/> </p>    <spanid= " tishi "></span> <p><inputid= " subbtn "type= " button "value= " ajax 测试 "/></p>     2.服务器 PHP 代码如下 <?php echo json_encode($_POST);