最近有一个任务,是实现msn消息框的功能.
一共做了三个版本:
1、用asp.net实现网页中弹出消息框
这个我采用了一个.net的第三方控件（这个控件在网上找一下就行）,可是这个控件只能显示在网页区域内，也就是说,它无法真正实现和msn一样的消息框功能。无柰，只好放弃。不过，如果只需要在网页区域中显示的话，可以采用它.
2、用javascript去实现该功能
这回采用javascript去实现。代码如下：
<script language="javascript">
<!--
/*
* 消息构造
*/
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;
}
/*
* 隐藏消息方法
*/
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是马上消失,否则为逐渐消失
}
me.pop.show(x,y,width,height);
}
}
this.timer = window.setinterval(fun,this.speed)
}
}
/*
* 消息卸载事件，可以重写
*/
class_msn_message.prototype.onunload = function() {
return true;
}
/*
* 消息命令事件，要实现自己的连接，请重写它
*
*/
class_msn_message.prototype.oncommand = function(){
this.hide();
window.open('http://www.google.com');
}
/*
* 消息显示方法
*/
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=关闭 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)//让消息框消失
{
me.timeout--;
if(me.timeout==0)//当消息框在页面中显示的时间到期时，将消息框隐藏
{
//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();
}
}
/*
** 设置速度方法
**/
class_msn_message.prototype.speed = function(s){
var t = 20;
try {
t = praseint(s);
} catch(e){}
this.speed = t;
}
/*
** 设置步长方法
**/
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 是任务栏，availheight代表当前任务栏的高度
//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 是任务栏，availheight代表当前任务栏的高度
msg1.speed = 10;
msg1.step = 5;
//alert(msg1.top);
//msg1.hide();
window.settimeout('ktime()',1000);
msg1.show();
}
}
}
function ktime()
{
window.settimeout('ktime()',1000);
}
//同时两个有闪烁，只能用层代替了，不过层不跨框架
//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">
<table id="table2" cellspacing="0"
cellpadding="0" width="100%" border="0">
<tr>
<td valign="top"><asp:panel id="panel1" runat="server"><font face="宋体">
<table id="table1" cellspacing="0" cellpadding="0" width="783"
border="0">
<tbody>
<tr>
<td >
<asp:label id="label3" runat="server">标 题</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">显示文字</asp:label></td>
<td><font face="宋体"><input id="teshow" type="text" size="50" value="请点击查看详细信息!"></font></td>
</tr>
<tr>
<td >
<asp:label id="label2" runat="server">显示次数</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>
这个方法可以实现msn的功能。但还是有一毛病，就是，不能同时出现两个或以上的消息框，否则刷新将十分严重。这样的话，可该怎么办呢？
最后，我实现没有办法了，我只好用c#来实现这个功能
3、用window窗体实现msn消息框功能
这个例子我是照msdn上的一篇例子做的，我在这里只提供一个网址，因为这个网址包含的范例做的更好一些，我做的拿不出手的程序在这里就不提了
http://www.microsoft.com/china/msdn/library/netframework/netframework/windowsforms.mspx
总结一下：
在这里，我提供了三种方法。各位可因人而宜。不过注意一点的是，如采用第二种方法，就必须将不断闪烁的缺点克服。如果各位高手中有知道如何去掉这个错误的话，请教教小弟！这里不胜感激！
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