                        課程
                    
                        /前端開發(fā)
                        
                            /JavaScript
                        
                        /DOM事件探秘

關(guān)于DOM事件的檢測問題。

<!doctype html>
<html>
<head>
?? ?<meta charset="UTF-8">
?? ?<title>Document</title>
?? ?<style>
?? ? *{margin:0;padding:0;}
???? .head{font-size:12px;padding:6px 0 0 10px;}
???? #login_box{width:300px;height:150px;background:#eee;
???? border:1px solid #ccc;position:absolute;left:50%;top:50%;margin-left:-150px;margin-top:-75px;display:none;}
???? #login_box p{height:20px;border-bottom:1px solid #ccc;font-size:12px;padding:6px 0 0 5px;font-weight:bold;}
???? #close{width:14px;height:14px;background:url(close.png) no-repeat;position:absolute;right:4px;top:6px;}
?? ?</style>
?? ?<script>
????? window.onload=function(){
???? ??? ?var login_btn=document.getElementById('login'),
???? ??? ???? login_box=document.getElementById('login_box'),
???? ??? ???? close=document.getElementById('close');
???? ??? ?// 封裝添加事件監(jiān)聽程序
??????? function addEvent(ele,type,hander){
????????? if(ele.addEventListener){
??????????? ele.addEventListener(type,hander,false);
????????? }else if(ele.attachEvent){
??????????? ele.attachEvent('on'+type,hander);
????????? }else{
???????? ??? ?ele['on'+type]=hander;
????????? }
???? ??? ?}
??????? // 顯示登錄層函數(shù)
???? ??? ?function showLogin(){
???? ??? ??? ?login_box.style.display='block';
???? ??? ?}
??????? // 隱藏登錄層函數(shù)
??????? function hideLogin(){
????????? login_box.style.display='none';
??????? }
??????? //點擊登錄按鈕顯示登錄層
??????? addEvent(login_btn,'click',showLogin);
??????? //點擊關(guān)閉按鈕隱藏登錄層
??????? addEvent(close,'click',hideLogin);
????? }
?? ?</script>
</head>
<body>
?? ?<div>親，您好！<input type="button" value="登錄" id="login"></div>
?? ?<div id="login_box">
?? ??? ?<p>用戶登錄</p><span id="close"></span>
?? ?</div>
</body>
</html>
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