JS类 封装常用javascript以便PHP快速调用

<?php
//
// +----------------------------------------------------------------------+
// | JS        javascript 类                                              |
// +----------------------------------------------------------------------+
// | Copyright (c) 2001 NetFish Software                                  |
// |                                                                      |
// | Author: whxbb(whxbb@21cn.com)                                        |
// +----------------------------------------------------------------------+
//
// $Id: js.class.php,v 0.1 2001/8/5 18:48:33 yf Exp $
//

// 禁止直接访问该页面
if (basename($HTTP_SERVER_VARS['PHP_SELF']) == "js.class.php") {
    header("HTTP/1.0 404 Not Found");
}

/**
* Purpose
* 封装了一些常用的Javascript代码，以便在PHP中快速调用
* @author  : whxbb(whxbb@21cn.com)
* @version : 0.1
* @date    :  2001/8/5
*/
class JS
{
    function JS(){}
    
    /**
     *　返回上页
     * @param $step 返回的层数 默认为1
     */
    function Back($step = -1)
    {
        $msg = "history.go(".$step.");";
        JS::_Write($msg);
        JS::FreeResource();
        exit;
    }

    /**
     * 弹出警告的窗口
     * @param $msg 警告信息
     */
    function Alert($msg)
    {
        $msg = "alert(\"".$msg."\");";
        JS::_Write($msg);
    }
    /**
     * 写js
     * @param $msg
     */
    function _Write($msg)
    {
        echo "<script language=\"javascript\">\n";
        echo $msg;
        echo "\n</script>";
    }

    /**
     * 刷新当前页
     */
    function Reload()
    {
        $msg = "location.reload();";
        JS::FreeResource();
        JS::_Write($msg);
        exit;
    }
    /**
     * 刷新弹出父页
     */
    function ReloadOpener()
    {
        $msg = "if (opener)    opener.location.reload();";
        JS::_Write($msg);
    }

    /**
     * 跳转到url
     * @param $url 目标页
     */
    function Goto($url)
    {
        $msg = "location.href = '$url';";
        JS::FreeResource();
        JS::_Write($msg);
        exit;
    }
    /**
     * 关闭窗口
     */
     function Close()
     {
         $msg = "window.close()";
        JS::FreeResource();
        JS::_Write($msg);
        exit;
        
     }
    /**
     * 提交表单
     * @param $frm 表单名
     */
    function Submit($frm)
    {
        $msg = $frm.".submit();";
        JS::_Write($msg);
    }
    /**
     * 关闭数据库连接
     */
    function FreeResource()
    {
        // 数据库连接标志
        global $conn;
        if (is_resource($conn))
            @mysql_close($conn);
    }
}
?>