最近有一個任務,是實現msn消息框的功能.

一共做了三個版本:
1、用asp.net實現網頁中彈出消息框
    這個我采用了一個.net的第三方控件（這個控件在網上找一下就行）,可是這個控件只能顯示在網頁區域內，也就是說,它無法真正實現和msn一樣的消息框功能。無柰，只好放棄。不過，如果只需要在網頁區域中顯示的話，可以采用它.

2、用javascript去實現該功能
    這回采用javascript去實現。代碼如下：
        <script language="javascript"> 

<!-- 
 
/* 
 *    消息構造 
 */ 
function class_msn_message(id,width,height,caption,title,message,target,action){ 
    this.id     = id; 
    this.title  = title; 
    this.caption= caption; 
    this.message= message; 
    this.target = target; 
    this.action = action; 
    this.width    = width?width:200; 
    this.height = height?height:120; 
    this.timeout= 150; 
    this.speed    = 20;
    this.step    = 1;
    this.right    = screen.width -1; 
    this.bottom = screen.height;
    this.left    = this.right - this.width;
    this.top    = this.bottom - this.height;
    this.timer    = 0;
    this.pause    = false;
    this.close    = false;
} 
 
/* 
 *    隱藏消息方法 
 */ 
class_msn_message.prototype.hide = function(){ 
    if(this.onunload()){ 

        var offset  = this.height>this.bottom-this.top?this.height:this.bottom-this.top;
        var me  = this; 
 
        if(this.timer>0){  
            window.clearinterval(me.timer); 
        } 
 
        var fun = function(){ 
            if(me.pause==false||me.close){
                var x  = me.left;
                var y  = 0;
                var width = me.width;
                var height = 0;
                if(me.offset>0){
                    height = me.offset;
                }
    
                y  = me.bottom - height;
    
                if(y>=me.bottom){
                    window.clearinterval(me.timer); 
                    me.pop.hide(); 
                } else {
                    me.offset =me.offset - me.step; //等于0是馬上消失,否則為逐漸消失
                }
                me.pop.show(x,y,width,height);   
            }            
        } 
 
        this.timer = window.setinterval(fun,this.speed)     
    } 
} 
 
/* 
 *    消息卸載事件，可以重寫 
 */ 
class_msn_message.prototype.onunload = function() { 
    return true; 
} 
/* 
 *    消息命令事件，要實現自己的連接，請重寫它 
 * 
 */ 
class_msn_message.prototype.oncommand = function(){ 
    this.hide();
    window.open('http://www.google.com');   
} 
 
/* 
 *    消息顯示方法 
 */ 
class_msn_message.prototype.show = function(){ 

    var opopup = window.createpopup(); //ie5.5+ 
   
    this.pop = opopup; 
 
    var w = this.width; 
    var h = this.height; 
 
    var str = "<div style='border-right: #455690 1px solid; border-top: #a6b4cf 1px solid; z-index: 99999; left: 0px; border-left: #a6b4cf 1px solid; width: " + w + "px; border-bottom: #455690 1px solid; position: absolute; top: 0px; height: " + h + "px; background-color: #c9d3f3'>" 
        str += "<table style='border-top: #ffffff 1px solid; border-left: #ffffff 1px solid' cellspacing=0 cellpadding=0 width='100%' bgcolor=#cfdef4 border=0>" 
        str += "<tr>" 
        str += "<td style='font-size: 12px;color: #0f2c8c' width=30 height=24></td>" 
        str += "<td style='padding-left: 4px; font-weight: normal; font-size: 12px; color: #1f336b; padding-top: 4px' valign=center width='100%'>" + this.caption + "</td>" 
        str += "<td style='padding-right: 2px; padding-top: 2px' valign=center align=right width=19>" 
        str += "<span title=關閉 style='font-weight: bold; font-size: 12px; cursor: hand; color: red; margin-right: 4px' id='btsysclose' >×</span></td>" 
        str += "</tr>" 
        str += "<tr>" 
        str += "<td style='padding-right: 1px;padding-bottom: 1px' colspan=3 height=" + (h-28) + ">" 
        str += "<div style='border-right: #b9c9ef 1px solid; padding-right: 8px; border-top: #728eb8 1px solid; padding-left: 8px; font-size: 12px; padding-bottom: 8px; border-left: #728eb8 1px solid; width: 100%; color: #1f336b; padding-top: 8px; border-bottom: #b9c9ef 1px solid; height: 100%'>" + this.title + "<br><br>" 
        str += "<div style='word-break: break-all' align=left><a href='javascript:void(0)' hidefocus=false id='btcommand'><font color=#ff0000>" + this.message + "</font></a></div>" 
        str += "</div>" 
        str += "</td>" 
        str += "</tr>" 
        str += "</table>" 
        str += "</div>" 
 
    opopup.document.body.innerhtml = str;
   
 
 
    this.offset  = 0;
    var me  = this; 

    opopup.document.body.onmouseover = function(){me.pause=true;}
    opopup.document.body.onmouseout = function(){me.pause=false;}

    var fun = function(){ 
        var x  = me.right;        
        var y  = 0;
        var width    = me.width;
        var height    = me.height;
 
            if(me.offset>me.height){
                height = me.height;
            } else {
                height = me.offset;
            }
 
        y  = me.bottom - me.offset;
        if(y<=me.top)//讓消息框消失
        {
            me.timeout--;
            if(me.timeout==0)//當消息框在頁面中顯示的時間到期時，將消息框隱藏
            {
      //alert(me.timer);
              window.clearinterval(me.timer); 
              me.hide();
   }
        }
        else
        {
            me.offset = me.offset + me.step;
        }
        me.pop.show(x,y,width,height); 
      // opopup.show(100, 100, 180, 25, str); 
 
    } 
 
    this.timer = window.setinterval(fun,this.speed)     
 
    
 
    var btclose = opopup.document.getelementbyid("btsysclose"); 
 
    btclose.onclick = function(){ 
        me.close = true;
        me.hide(); 
    } 
 
    var btcommand = opopup.document.getelementbyid("btcommand"); 
    btcommand.onclick = function(){ 
        me.oncommand(); 
    }   
} 

/*
** 設置速度方法
**/
class_msn_message.prototype.speed = function(s){
    var t = 20;
    try {
        t = praseint(s);
    } catch(e){}
    this.speed = t;
}
/*
** 設置步長方法
**/
class_msn_message.prototype.step = function(s){
    var t = 1;
    try {
        t = praseint(s);
    } catch(e){}
    this.step = t;
}
 
class_msn_message.prototype.rect = function(left,right,top,bottom){
    try {
        this.left        = left    !=null?left:this.right-this.width;
        this.right        = right    !=null?right:this.left +this.width;
        this.bottom        = bottom!=null?(bottom>screen.height?screen.height:bottom):screen.height;
        this.top        = top    !=null?top:this.bottom - this.height;
    } catch(e){}
}

function bb(ini)
{

 if(ini<=1)
 {
 
  //alert(window.form1.tetitle.value);
  var  msg1 = new class_msn_message(ini,200,120,"<image src='http://www.163design.net/n/c/oicq.gif'> 消息提示:",window.form1.tetitle.value,window.form1.teshow.value); 
     msg1.rect(null,null,null,screen.availheight); //screen 是任務欄，availheight代表當前任務欄的高度
     //alert(screen.availheight);
  msg1.speed    = 10;
  msg1.step    = 5;
  //alert(msg1.top);
  //msg1.hide(); 
 // window.settimeout('ktime()',120);
  msg1.show();
 }
 
 else if(ini>1)
 {
  for(i=1;i<=ini;i++)
  {
   var msg1 = new class_msn_message(i,200,120,"<image src='http://www.163design.net/n/c/oicq.gif'> 消息提示:",window.form1.tetitle.value,window.form1.teshow.value); 
   var popheight;
   if(i==1)
    popheight=screen.availheight;
   else
    popheight=popheight-120;
    
   
   msg1.rect(null,null,null,popheight); //screen 是任務欄，availheight代表當前任務欄的高度
   msg1.speed    = 10;
   msg1.step    = 5;
   //alert(msg1.top);
   //msg1.hide();
   window.settimeout('ktime()',1000);
   msg1.show();
  }
 }

 }
function ktime()
{
 window.settimeout('ktime()',1000);
}
 //同時兩個有閃爍，只能用層代替了，不過層不跨框架
//var msg2 = new class_msn_message("aa",200,120,"短消息提示：","您有2封消息","好的啊"); 
//   msg2.rect(100,null,null,screen.height);
//    msg2.show(); 
//--> 
  </script>
<form id="form1" method="post" runat="server">
   &nbsp;
   <table id="table2" cellspacing="0"
    cellpadding="0" width="100%" border="0">
    <tr>
     <td valign="top"><asp:panel id="panel1" runat="server"><font face="宋體">
        <table id="table1" cellspacing="0" cellpadding="0" width="783"
         border="0">
         <tbody>
          <tr>
           <td >
            <asp:label id="label3" runat="server">標　　題</asp:label></td>
           <td><input id="tetitle" type="text" size="50" value="msn message"
             runat="server"></td>
          </tr>
          <tr>
           <td >
            <asp:label id="label1" runat="server">顯示文字</asp:label></td>
           <td><font face="宋體"><input id="teshow" type="text" size="50" value="請點擊查看詳細信息!"></font></td>
          </tr>
          <tr>
           <td >
            <asp:label id="label2" runat="server">顯示次數</asp:label></td>
           <td><input id="cou" type="text" size="50">
      </asp:panel></td>
    </tr>
   </table>
   </font></td></tr>
   <tr>
    <td valign="top"><input type="button" value="快按一下吧"></td>
   </tr>
   </tbody></table></form>

這個方法可以實現msn的功能。但還是有一毛病，就是，不能同時出現兩個或以上的消息框，否則刷新將十分嚴重。這樣的話，可該怎么辦呢？

最后，我實現沒有辦法了，我只好用c#來實現這個功能

3、用window窗體實現msn消息框功能
    這個例子我是照msdn上的一篇例子做的，我在這里只提供一個網址，因為這個網址包含的范例做的更好一些，我做的拿不出手的程序在這里就不提了

http://www.microsoft.com/china/msdn/library/netframework/netframework/windowsforms.mspx

總結一下：

在這里，我提供了三種方法。各位可因人而宜。不過注意一點的是，如采用第二種方法，就必須將不斷閃爍的缺點克服。如果各位高手中有知道如何去掉這個錯誤的話，請教教小弟！這里不勝感激！