JavaScript实现添加及删除事件的方法小结

function $(id)
{
return document.getElementByIdx_x(id);
}
var ev = null;
var count1  = 0;
var count2  = 0;
var oncount1 = 0;
var oncount2 = 0;
var isSetEv1 = false;
var isSetEv2 = false;
//创建事件的通用函数
var EventUtil = function(){};
var flag = new Flag();
//监控变量值
function Flag()
{
var tempflag = false;
var method = null;
this.SetMethod = function(value)
{
  method = value;
} 
this.SetValue = function(value)
{
    tempflag = value;
    if(tempflag == true && method){eval_r(method)} 
}
this.GetValue = function()
{
  return tempflag;
}
}
EventUtil.addEventHandler = function(obj,EventType,Handler)
{
//如果是FF
if(obj.addEventListener)
{
  obj.addEventListener(EventType,Handler,false);
} 
//如果是IE
else if(obj.attachEvent)
{
  obj.attachEvent('on'+EventType,Handler);
} 
else
{
  obj['on'+EventType] = Handler;
}
}
//取消事件传入的参数值要跟绑定时完全一样才可以
EventUtil.removeEventHandler = function(obj,EventType,Handler)
{
//如果是FF
if(obj.removeEventListener)
{
  obj.removeEventListener(EventType,Handler,false);
} 
//如果是IE
else if(obj.detachEvent)
{
  obj.detachEvent('on'+EventType,Handler);
} 
else
{
  obj['on'+EventType] = Handler;
}
}
function setEvent1(e)
{
ev = e;//针对火狐获取event相关属性 
flag.SetMethod('addList1()');
flag.SetValue (true);
}
function setEvent2(e)
{
ev = e;//针对火狐获取event相关属性
flag.SetMethod('addList2()');
flag.SetValue (true);
}
function isSetEvent1(state)
{
isSetEv1 = state;//ie下方法名不能和全局变量名相同
}
function isSetEvent2(state)
{
isSetEv2 = state;
}
function add1(obj)
{
oncount1 = oncount1 + 1;
if(isSetEv1)
{
  obj.innerHTML = "设置了事件，添加了 <b>" + oncount1 + "</b> 篇文章,左边列表1自动增加！";
}
else
{
  obj.innerHTML = "没有设置事件，添加了 <b>" + oncount1 + "</b> 篇文章,左边列表1没有变化！";
}
}
function add2(obj)
{
oncount2 = oncount2 + 1;
if(isSetEv2)
{
  obj.innerHTML = "设置了事件，添加了 <b>" + oncount2 + "</b> 篇文章,左边列表2自动增加！";
}
else
{
  obj.innerHTML = "没有设置事件，添加了 <b>" + oncount2 + "</b> 篇文章,左边列表2没有变化！";
}
}
function addList1()
{
count1 = count1 + 1;
$("list1").innerHTML = "动态添加了 <b>" + count1 + "</b> 篇文章了!";
}
function addList2()
{
count2 = count2 + 1;
$("list2").innerHTML = "动态添加了 <b>" + count2 + "</b> 篇文章了!";
}

//通用的添加和删除事件的方法(兼容IE和firefox)
function AddEventHandler(oTarget, sEventType, fnHandler){
  if (oTarget.addEventListener) {//非IE
  oTarget.addEventListener(sEventType, fnHandler, false);
  }else if (oTarget.attachEvent) {//IE
   oTarget.attachEvent('on' + sEventType, fnHandler);
  }else {
   oTarget['on' + sEventType] = fnHandler;
  }
}
function RemoveEventHandler(oTarget, sEventType, fnHandler){
  if (oTarget.removeEventListener) {//非IE
  oTarget.removeEventListener(sEventType, fnHandler, false);
  }else if (oTarget.detachEvent) {//IE
   oTarget.detachEvent('on' + sEventType, fnHandler);
  }else {
   oTarget['on' + sEventType] = null;
  }
}

<!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=utf-8" />
<title>JavaScript添加、删除事件的方法</title>
<script type="text/javascript">
var EventUtil=new Object;
EventUtil.addEvent=function(oTarget,sEventType,funName){
  if(oTarget.addEventListener){//for DOM;
 oTarget.addEventListener(sEventType,funName, false);
 }else if(oTarget.attachEvent){
 oTarget.attachEvent("on"+sEventType,funName);
 }else{
 oTarget["on"+sEventType]=funName;
 }
};
EventUtil.removeEvent=function(oTarget,sEventType,funName){
  if(oTarget.removeEventListener){//for DOM;
 oTarget.removeEventListener(sEventType,funName, false);
 }else if(oTarget.detachEvent){
 oTarget.detachEvent("on"+sEventType,funName);
 }else{
 oTarget["on"+sEventType]=null;
 }
};
function removeClick(){
 alert("click");
 var oDiv=document.getElementById("odiv");
 oDiv.style.cursor="auto";
 EventUtil.removeEvent(oDiv,"click",removeClick);
}
function addLoadEvent(func){
  var oldonload=window.onload;
  if(typeof window.onload !="function"){
    window.onload=func;
  }else{
    window.onload=function(){
      oldonload();
      func();
    }
  }
}
addLoadEvent(addClick);
function addClick(){
 var oDiv=document.getElementById("odiv");
 oDiv.style.cursor="pointer";
 EventUtil.addEvent(oDiv,"click",removeClick);
}
</script>
</head>
<body>
<p>第一次点的时候弹出警告，并移除click事件,再点点击就失效了</p>
<div id="odiv" style="background:#003399; height:70px; width:126px; margin:0 auto; color:skyblue; ">第一次警告，第二次没反应！</div>
</body>
</html>