<!-- description:JS类中event的简单实现2 code by Lonsan on 2005 email:Lonsan21@163.com 请各位多批评指导，谢谢--><html><head><title> JS Event2 </title><style></style></head><body></body></html>
<script language="javascript">
<!--//实现，实现类似C#风格调用//已经支持+=和-=操作符，但是还存在很多问题，正寻求解决方法 //注：参考了birdshome提示，在此表示感谢。function RaiseEvent(sender,event)
{ var funs=""; for(var k in EventHandler.Events) { if(k=="length") continue; if((event&EventHandler.Events[k].ID)>0) { funs += k+"(sender);\n";
} } eval("var f = function(sender){\n"+funs+"\n}"); f(sender);}function EventHandler(o){ this.EventID; var fname; if(typeof o=="function") { fname = o.toString().match(/function([^\0\(]*)\(/)[1]; if(EventHandler.Events[fname]==null) { this.EventID = (1<<EventHandler.Events.length); EventHandler.Events[fname] = {ID:this.EventID}; EventHandler.Events.length++; } else { this.EventID = EventHandler.Events[fname].ID; } }}EventHandler.Events={length:0};EventHandler.Null=0;EventHandler.prototype.toString = function(){ return this.EventID;}////////////////////////////////////////////////////////////////////////////////////////////////////////////////示例function Persion(){}Persion.prototype.onBeginSpeak=EventHandler.Null;Persion.prototype.name="Lonsan";Persion.prototype.Speak = function(sWords){ RaiseEvent(this, this.onBeginSpeak); alert("正在讲话。。。\n以下是讲话内容：\n"+sWords);}var p = new Persion()//test1p.onBeginSpeak += new EventHandler(BeginSpeak1);p.onBeginSpeak += new EventHandler(BeginSpeak2);alert("测试1开始！！");p.Speak("大家好，我是"+p.name+"。");//test2p.onBeginSpeak -= new EventHandler(BeginSpeak2);p.onBeginSpeak += new EventHandler(BeginSpeak3);alert("测试2开始！！");p.Speak("第二次\n已经取消BeginSpeak2事件。\n我是"+p.name+"。");function BeginSpeak1(sender){ alert("处理BeginSpeak事件！--1\n");}function BeginSpeak2(sender){ alert("处理BeginSpeak事件！--2");}function BeginSpeak3(sender){ sender.name="(Lonsan)蓝山"; alert("处理BeginSpeak事件！--3");}
//--></script>