ajax结合mysql数据库和smarty实现局部数据状态的刷新方法

?php
  include './include/Mysql.class.php';
  include './libs/Smarty.class.php';
  $db=new Mysql;
  $smarty=new Smarty;
  $lists=$db->getALL('users');
  $smarty->assign('lists',$lists);
  $smarty->display('list.html');
?>

!DOCTYPE html>
html>
head>
  meta charset=utf-8>
  title>用户权限展示表/title>
/head>
body>
    table align="center" border="1" width="500">
      center>h2>用户权限表/h2>/center>
      tr>
        th>uid/th>th>用户名/th>th>密码/th>th>锁定状态/th>th>角色/th>
      /tr>  
      {foreach $lists as $list}
        tr align="center">
          td>{$list.uid}/td>
          td>{$list.username}/td>
          td>{$list.password}/td>
          {if $list.is_lock==1}
            td>a href="javascript:lock(0,{$list.uid});" rel="external nofollow" >锁定/a>/td>
            {else}
            td>a href="javascript:lock(1,{$list.uid})" rel="external nofollow" ;>取消锁定/a>/td>  
          {/if}    
          {if $list.role==1}
              td>管理员/td>
          {else}
              td>编辑者/td>    
          {/if}
        /tr>    
      {/foreach}  
    /table>  
/body>
    script type="text/javascript">
      function lock(lock,uid){
          //创建ajax对象
          var xhr=new XMLHttpRequest();
          //打开一个链接
          xhr.open('get','02.php?is_lock='+lock+"uid="+uid);
          //发送ajax请求
          xhr.send(null);
          //设置回调、监听函数
          xhr.onreadystatechange=function(){
            //如果ajax状态码响应正常且网络正常，获取响应文本
            if(xhr.readyState==4xhr.status==200){
              if(xhr.responseText){
                window.location.reload();
              }else{
                alert("切换状态失败！");
              }
            }
          }
        }
    /script>
/html>

?php
  include './include/Mysql.class.php';
  $lock=$_GET['is_lock'];
  $uid=$_GET['uid'];
  $db=new Mysql;
  $result=$db->update('users',"is_lock=$lock","uid=$uid");
  if($result){
    echo true;
  }else{
    echo false;
  }
?>