菜鸟问题：为什么取不出来值！

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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>[ 办公系统 ]</title>
<style type="text/css">
<!--
body {  font-size: 12px; cursor: default}
td {  font-size: 12px; cursor: default}
input {  font-size: 12px}
a:link {  color: #000099; text-decoration: none}
a:visited {  color: #000099; text-decoration: none}
a:hover {  text-decoration: underline; color: #0000FF}
.Input {  font-size: 12px; background-color: #FFFFFF; height: 20px;BORDER: #333333 solid 1px}
.radio {  height: 13px}
-->
</style><SCRIPT language="javascript">
var doc = document;
function init()
{
        self.focus();
        if( top.name != self.name && self.name != "main" && self.name != "viewFrame" && self.name != "mailMain")  //在窗口中显示不出，则全屏
        {
                top.close;
                top.opener=self;
                top.location.href="login.php";
                return;
        }
}</SCRIPT>
</head><body leftmargin="0" topmargin="0" marginwidth="0" marginheight="0" bgcolor="#4255BD" onload="javascript:init();"><SCRIPT ID=clientEventHandlersJS LANGUAGE=javascript>
<!--
//去掉字符串的首尾空格
function ThrowBlank(string)
{
        var msg="";        msg=string;
        while(msg.substring(0,1)==" ")
        {
                msg=msg.substring(1,msg.length);
        }
        return msg;
}function CheckPages()
{
        if (ThrowBlank(document.LoginForm.loginuser.value) == "")
        {
                 alert("请输入登录名");
                 //document.LoginForm.loginuser.value ="";
                 document.LoginForm.loginuser.focus();
                 return false;
        }
        if ( ThrowBlank(document.LoginForm.loginpass.value)=="" )
        {
                alert("请输入密码");
                //document.LoginForm.loginpass.value="";
                document.LoginForm.loginpass.focus();
                return false;
        }
        return true;
}function datacheck()
{
        if (CheckPages())
        {
                LoginForm.action = "login.php?action=login";
                //login.submit();
                return true;
        }
        return false;
}
//-->
</SCRIPT>
<Form id="LoginForm" name="LoginForm" method=post>
<input type=hidden name='cur_' value=''>
<input type=hidden name='act_' value=''>
<input type=hidden name='sact_' value=''>
<div align="center"><img src="images/shim.gif" width="504" height="30"></div>
<table width="100%" border="0" cellspacing="0" cellpadding="0" height="90%">
  <tr>
    <td align="center">
      <table width="100%" border="0" cellspacing="0" cellpadding="0">
        <tr>
          <td background="images/bgImage.gif" align="center">
            <table width="504" cellspacing="0" cellpadding="0" border="0">
              <tr>
                  <td height="82"><font color="#FF3300"><img src="images/shim.gif" width="5" height="82"></font></td>
              </tr>
              <tr>
                  <td height="177" background="images/homeImage.gif"><img src="images/shim.gif" width="5" height="177" align="top"></td>
              </tr>
              <tr>
                  <td height="81" background="images/homeBottom.gif" valign="bottom" align="center">
                    <table height="73">
                    <tr>
                        <td width="210">
                          <table cellpadding="0" cellspacing="0" border="0">
                            <tr>
                              <td width="60">用户名称:</td>
                              <td>
                                <input name="loginuser" style="width:120px" class="Input" value="">
                              </td>
                            </tr>
                            <tr>
                              <td>口　　令:</td>
                              <td>
                                <input name="loginpass" type="password" style="width:120px" class="Input" maxlength=16>
                              </td>
                            </tr>
                          </table>
                        </td>
                        <td width="100">
                          <input type="hidden" name="fromURL" value="maximize.asp">
                          <input type="image" name="login" src="images/loginButton.gif" width="73" height="60" border="0" alt="登 录" onclick="javascript:return datacheck();">                        </td>
                      <td>
                        <table cellpadding="3">
                        </table>
                      </td>
                    </tr>
                  </table>
                  </td>
              </tr>
            </table>
          </td>
        </tr>
      </table>
      <img src="images/shim.gif" width="504" height="65"></td>
  </tr>
</table>
</Form>
<?if($action == 'login') {//echo $loginuser;exit;   $connect = mysql_pconnect("localhost","root","hcedagb");
   mysql_select_db("icbcoa",$connect);
   if ($loginuser)
   {
     $query = "select * from oa_user where username='".$loginuser."'";
     $query.=" and password ='" . $loginpass ."'";
     $result = mysql_query($query);
     if(@mysql_num_rows($result)>0)
     {
        @mysql_data_seek($result,0);
        $data = @mysql_fetch_array($result);
        session_start();
            //  注册登陆成功的 admin 变量，并赋值 true
        $_SESSION["admin"] = true;
        $_SESSION["susername"] = $data[username];
        $_SESSION["susername"] = $data[username];
        $_SESSION["shangming"] = $data[hangming];
        $_SESSION["sbumen"] = $data[bumen];
        $_SESSION["sjibie"] = $data[jibie];
        $_SESSION["sgangwei"] = $data[jibie];
        $url = "index.php";
        $show_message .= "<meta http-equiv=\"refresh\" content=\"0;url=$url\">";
        echo $show_message;
        exit;
     }
     else
     {
     ?>
       <SCRIPT language="javascript">
       alert("对不起，您的登陆信息错误，请重新登陆");
       </script>
     <?
     }
   }
   mysql_close($connect);
}
?></body>
</html>

解决方案 »

  1.   

    session_start();-----------------------
    write it on the top of the page.
      

  2.   

    session变量用字段赋值，显示变量值是空。
      

  3.   

    $_SESSION["admin"] = true;
            $_SESSION["susername"] = $data[username];
            $_SESSION["susername"] = $data[username];
            $_SESSION["shangming"] = $data[hangming];
            $_SESSION["sbumen"] = $data[bumen];
            $_SESSION["sjibie"] = $data[jibie];
            $_SESSION["sgangwei"] = $data[jibie];
    ==========================
    $_SESSION["admin"] = true;
            $_SESSION["susername"] = $data['username'];
            $_SESSION["susername"] = $data['username'];
            $_SESSION["shangming"] = $data['hangming'];
            $_SESSION["sbumen"] = $data['bumen'];
            $_SESSION["sjibie"] = $data['jibie'];
            $_SESSION["sgangwei"] = $data['jibie'];