<div style="height:1000px;width:100%"></div>
  <?php
 header("Content-Type:text/html;charset=utf-8"); 
 session_start(); 
 //首先判断Cookie是否有记住用户信息 
 if(isset($_COOKIE['username'])) 
 { 
  $_SESSION['username']=$_COOKIE['username']; 
  $_SESSION['islogin']=1; 
 } 
 if(isset($_SESSION['islogin'])) 
 { 
  //已经登录  
  echo $_SESSION['username'].":你好，欢迎进入个人中心！<br/>"; 
  echo "<a href='logout.php'>注销</a>"; 
 } 
 else
 { //为登录 
  echo  '
  <script LANGUAGE="JavaScript"> 

   window.location="ht.html";
  </script>
  
  ';
 }
 ?>
  <?php
  if(isset($_POST["tj"])){
      $zt=$_POST["zt"];
       $content = file_get_contents("zt.txt");
           file_put_contents("zt.txt",$zt);
		  // echo "<script language=javascript>alert('留言成功！');history.go(-1);</script>";
		  echo "<script language=javascript>alert('保存成功！');window.location='ht.php';</script>";
  }else{
      echo "<script language=javascript>alert('非法闯入，请马上离开！');window.location='ht.html';</script>";
  }
  ?>