怎么做出一个淡化出错的弹出窗口，消失也让它慢慢减淡至消失？

不是winform，浏览器本身是没有这种接口。只能用一些Element或者createPopup来模拟。

解决方案 »

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说点个人看法:
1:打开一个窗口;
2:定一段时间,让窗口慢慢的变小,背景慢慢变淡,
3:最终关闭窗口
在哪里看见的效果就把它的代码扒下来. 其实就是用一个浮动的div然后不断改变其透明度.
好象是寻梦草人的随即出现图片位置的代码，我把位置稍微改了下
<body>
<img name="img1" src="http://community.csdn.net/images/csdn.gif" style="position:absolute;filter:alpha(opacity=0);">
</body>
<script language=javascript>
function fade(o){
this.obj = o;
this.offset=5;
this.timer = null;
this.act   = "in";
this.action= function(){
var curOpacity = this.obj.filters.alpha.opacity;
if( this.act == "out" )
{
if(curOpacity > 0)
{
this.obj.filters.alpha.opacity-=this.offset;
}
else
{
this.act = "in";
this.obj.style.left= 0 + "px";
this.obj.style.top = 0 + "px";
}
}
else
{
if(curOpacity<100)
{
this.obj.filters.alpha.opacity+=this.offset;
}
else
{
this.act = "out";
}
}
};
this.play = function(){
var self=this;
var f = function(){self.action()};
this.timer=setInterval(f,40);
};
this.stop = function(){
if(this.timer) clearInterval( this.timer );
};
}
var m1 = document.images[0];
var f1 = new fade(m1);
f1.play();
</script>
aspx文件：
<%@ Page language="c#" Codebehind="index.aspx.cs" AutoEventWireup="false" Inherits="WebApplication2.WebForm1" %>
<%@ Register TagPrefix="cc1" Namespace="EeekSoft.Web" Assembly="EeekSoft.Web.PopupWin" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>WebForm1</title>
<meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
<meta name="CODE_LANGUAGE" Content="C#">
<meta name="vs_defaultClientScript" content="JavaScript">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
</HEAD>
<body MS_POSITIONING="GridLayout">
<form id="Form1" method="post" runat="server">
<FONT face="宋体">
<cc1:PopupWin id="PopupWin" colorstyle="Blue" runat="server" visible="false" dockmode="BottomRight"
Height="100px" OffsetY="5" OffsetX="5"></cc1:PopupWin></FONT>
</form>
</body>
</HTML>
cs文件：
private void Page_Load(object sender, System.EventArgs e)
{
// 在此处放置用户代码以初始化页面
PopupWin.ActionType=EeekSoft.Web.PopupAction.MessageWindow;
PopupWin.Title="测试弹出框";
PopupWin.Message="<i>消息</i>displayed in popup";
PopupWin.Text="Text to show in new window.."; PopupWin.HideAfter=5000;
PopupWin.ShowAfter=500;
PopupWin.Visible=true;
}
至于PopupWin这个库文件，你要，就留下email!
<script>
var timer
var Opacity = 0
function hide() {
  oDiv.style.display = "block"
  oDiv.style.height = document.body.scrollHeight
  Opacity = 0
  event.srcElement.blur()
  timer = window.setInterval("aa()", 1)
}function aa()
{
  if (Opacity == 50)
  {
    window.clearInterval(timer)
    oButton.style.display = "block"
    return
  }
  Opacity = ( Opacity + 3 ) > 50 ? 50 : Opacity + 3
  oDiv.style.filter = "Alpha(Opacity="  + Opacity + ")"
}function bb()
{
  if (Opacity == 0)
  {
    window.clearInterval(timer)
    oDiv.style.display = "none"
    return
  }
  Opacity = (Opacity - 3 < 0) ? 0 : Opacity - 3
  oDiv.style.filter = "Alpha(Opacity="  + Opacity + ")"

}function cc()
{
  timer = window.setInterval('bb()', 5);
  oButton.style.display='none';
}
</script>
<body topmargin=0 leftmargin=0>
<div id=oDiv style="position:absolute;z-index:99; background-color:darkgray; Filter: Alpha(Opacity=0); border:1px solid #333333;display:none;width:100%;vertical-align:center;text-align:center"></div>
<button onclick=hide()>hide</button>
<button id=oButton style="position:absolute; left:100;top:200;z-index:100;display:none" onclick="cc()">确定</button>
<script>
  for (var i=0; i<30; i++)
  document.write ("<p>123</p>")
</script>
http://blog.never-online.net/article.asp?id=22