<font color=green>Js的MessageBox</font>


答案：看到论坛上有人模仿alert　自己也写了一个 
本来想模仿winapi里的MessageBox  
但可惜js 不支持　阻塞模式　 
返回值只能用异步了。 
支持　FF ie opera 
DOCTYPE 可以申明　也可以不申明 
存在问题　 
在opera 里图层不能透明　 
对于页面内有iframe的也无法使用 
在ie里无法遮住select的 
复制代码 代码如下:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> 
<title>MessageBox演示</title> 
<script language="javascript"> 
/*******************************************************************************************    
 * http://2lin.net 
 * Email:caoailin@gmail.com  
 * QQ:38062022  
 * Creation date: 2006-11-27  
 * 下面的内容可以拷贝到一个JS文件里面 
*********************************************************************************************/ 


// 控制按钮常量 
var MB_OK = 0; 
var MB_CANCEL = 1; 
var MB_OKCANCEL = 2; 
var MB_YES = 3; 
var MB_NO = 4; 
var MB_YESNO = 5; 
var MB_YESNOCANCEL = 6; 

// 控制按钮文本 
var MB_OK_TEXT = "确定"; 
var MB_CANCEL_TEXT = "取消"; 
var MB_YES_TEXT = " 是 "; 
var MB_NO_TEXT = " 否 "; 

//提示图标 
var MB_ICON = "http://2lin.net/image/information.gif"; 


//委托方法 
var MB_OK_METHOD = null; 
var MB_CANCEL_METHOD = null; 
var MB_YES_METHOD = null; 
var MB_NO_METHOD = null; 
var MB_BACKCALL = null; 

var MB_STR = '<style type="text/css"><!--' + 
            'body{margin:0px;}' + 
            '.msgbox_title{background-color: #B1CDF3;height:25px;position:relative;font-size:14px;line-height:25px;padding-left:10px;border-bottom:1px solid #000;}' + 
            '.msgbox_control{text-align:center;clear:both;height:28px;}' + 
            '.msgbox_button{background-color: #B1CDF3;border:1px solid #003366;font-size:12px;line-height:20px;height:21px;}' + 
            '.msgbox_content{padding:10px;float:left;line-height: 20px;}' + 
            '.msgbox_icon{width: 50px;height: 50px;float: left;text-align: center;line-height:50px;padding-top:10px;}' + 
            '.msgbox_mask{position:absolute;left:0px;top:0px;z-index:99999;background-color:#333333;width:100%;height:100%;}' + 
            '.msgbox{background-color: #EFFAFE;position: absolute;height:auto;font-size:12px;top:50%;left:50%;border:1px solid #999999;}' + 
            '--></style>' + 
            '<div id="msgBoxMask" class="msgbox_mask" style="filter: alpha(opacity=0);display:none;"></div>' + 
            '<div class="msgbox" style="display:none; z-index:100000;" id="msgBox">' + 
            '<div class="msgbox_title" id="msgBoxTitle"></div>' + 
            '<div class="msgbox_icon" id="msgBoxIcon"></div>' + 
            '<div class="msgbox_content" id="msgBoxContent"></div>' + 
            '<div class="msgbox_control" id="msgBoxControl"></div></div>'; 

var Timer = null; 

document.write(MB_STR); 
var icon = new Image(); 
icon.src = MB_ICON; 

/* 提示对话框 
 * 参数 1 : 提示内容 
 * 参数 2 : 提示标题 
 * 参数 3 : 图标路径 
 * 参数 4 : 按钮类型 
*/ 

function MessageBox(){ 
   var _content = arguments[0] || "这是一个对话框！"; 
   var _title   = arguments[1] || "提示"; 
   var _icon    = arguments[2] || MB_ICON; 
   var _button  = arguments[3] || MB_OK; 
   MB_BACKCALL  = arguments[4]; 

   var _iconStr = '<img src="{0}">'; 
   var _btnStr  = '<input name="{0}" id="{0}" type="button" class="msgbox_button" value="{1}" onclick="MBMethod(this)" />'; 

    
   switch(_button) 
   {       
      case MB_CANCEL      : _btnStr = _btnStr.toFormatString("msgBoxBtnCancel", MB_CANCEL_TEXT); break; 

      case MB_YES         : _btnStr = _btnStr.toFormatString("msgBoxBtnYes", MB_YES_TEXT); break; 

      case MB_NO          : _btnStr = _btnStr.toFormatString("msgBoxBtnNo", MB_NO_TEXT); break; 

      case MB_OKCANCEL    :  
           _btnStr = _btnStr.toFormatString("msgBoxBtnOk", MB_OK_TEXT) + "  " + 
                      _btnStr.toFormatString("msgBoxBtnCancel", MB_CANCEL_TEXT);  
           break; 

      case MB_YESNO       : 
            _btnStr = _btnStr.toFormatString("msgBoxBtnYes", MB_YES_TEXT) + "  " + 
                      _btnStr.toFormatString("msgBoxBtnNo", MB_NO_TEXT);  
            break; 

      case MB_YESNOCANCEL : 
            _btnStr = _btnStr.toFormatString("msgBoxBtnYes", MB_YES_TEXT) + "  " + 
                      _btnStr.toFormatString("msgBoxBtnNo", MB_NO_TEXT) + "  " + 
                      _btnStr.toFormatString("msgBoxBtnCancel", MB_CANCEL_TEXT);  
            break; 

      default :  _btnStr = _btnStr.toFormatString("msgBoxBtnOk", MB_OK_TEXT);  break;   

   } 
   //解决　FF 下会复位 
   ScrollTop = GetBrowserDocument().scrollTop;  
   ScrollLeft = GetBrowserDocument().scrollLeft;  
   GetBrowserDocument().style.overflow = "hidden"; 
   GetBrowserDocument().scrollTop = ScrollTop;    
   GetBrowserDocument().scrollLeft = ScrollLeft;  

   $("msgBoxTitle").innerHTML = _title; 
   $("msgBoxIcon").innerHTML = _iconStr.toFormatString(_icon); 
   $("msgBoxContent").innerHTML = _content;  
   $("msgBoxControl").innerHTML =  _btnStr; 

   OpacityValue = 0; 
   $("msgBox").style.display = "";        
   try{$("msgBoxMask").filters("alpha").opacity = 0;}catch(e){}; 
   $("msgBoxMask").style.opacity = 0; 
   $("msgBoxMask").style.display = ""; 
   $("msgBoxMask").style.height = GetBrowserDocument().scrollHeight + "px"; 
   $("msgBoxMask").style.width = GetBrowserDocument().scrollWidth + "px"; 

   Timer = setInterval("DoAlpha()",1); 
   //设置位置    
   $("msgBox").style.width = "100%";    
   $("msgBox").style.width = ($("msgBoxIcon").offsetWidth + $("msgBoxContent").offsetWidth + 2) + "px"; 

   $("msgBox").style.marginTop = (-$("msgBox").offsetHeight/2 + GetBrowserDocument().scrollTop) + "px"; 
   $("msgBox").style.marginLeft = (-$("msgBox").offsetWidth/2 + GetBrowserDocument().scrollLeft) + "px";    

   if(_button == MB_OK || _button == MB_OKCANCEL){ 
     $("msgBoxBtnOk").focus(); 
   }else if(_button == MB_YES || _button == MB_YESNO || _button == MB_YESNOCANCEL){ 
       $("msgBoxBtnYes").focus(); 
   }   

} 

var OpacityValue = 0; 
var ScrollTop = 0; 
var ScrollLeft = 0; 

function GetBrowserDocument() 
{ 
   var _dcw = document.documentElement.clientHeight; 
   var _dow = document.documentElement.offsetHeight; 
   var _bcw = document.body.clientHeight; 
   var _bow = document.body.offsetHeight; 

   if(_dcw == 0) return document.body; 
   if(_dcw == _dow) return document.documentElement; 

   if(_bcw == _bow && _dcw != 0)  
     return document.documentElement; 
   else 
     return document.body; 
} 

function SetOpacity(obj,opacity){ 
        if(opacity >=1 ) opacity = opacity / 100;     

        try{obj.style.opacity = opacity; }catch(e){} 

        try{  
            if(obj.filters){ 
                obj.filters("alpha").opacity = opacity * 100; 
            } 

        }catch(e){} 
} 

function DoAlpha(){ 
    if (OpacityValue > 20){clearInterval(Timer);return 0;} 
    OpacityValue += 5;     
    SetOpacity($("msgBoxMask"),OpacityValue); 
} 

function MBMethod(obj) 
{    
   switch(obj.id) 
   {
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