JavaScript添加、删除事件的方法

答案：<!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>
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