<html>
<head>
<title>
事件冒泡与事件捕获示例
</title>
<style type="text/css">
div{
color:red;
}
</style>
</head>
<body>
<div id="myDiv" class="main" onclick="alert('click div');">
<p>div接受点击事件</p>
<form method="post">
<input type="text" name="username" value="zhang">
<input type="button" id="mybtn" value="click me">
</form>
</div>
<ol id="dropdown">
<li><a href="#">List item 1</a>
<ol>
<li><a href="#">List item 1.1</a></li>
<li id="myli"><a href="#">List item 1.2</a></li>
<li><a href="#">List item 1.3</a></li>
</ol>
</li>
</ol>
<script type="text/javascript">
var btn=document.getElementById("mybtn");
var myol=document.getElementById("dropdown");
var myli=document.getElementById("myli");
var handler=function(event){
switch (event.type){
case "click":
alert("click button");
break;
/*
case "mouseover":
event.target.style.backgroundColor="green";
alert(event.screenX+","+event.screenY);
break;
case "mouseout":
event.target.style.backgroundColor="";
break;
*/
}
}
var handler2=function(){
alert("click ol");
}
var handler3=function(){
alert("click li");
}
//冒泡阶段处理事件，自下而上执行
btn.addEventListener("click",handler,false);
btn.addEventListener("mouseover",handler,false);
btn.addEventListener("mouseout",handler,false);
//捕获阶段处理事件，自上而下执行
myol.addEventListener("focus",handler2,true);
myli.addEventListener("focus",handler3,true);
</script>
</body>
</html>
时间： 2024-10-06 23:14:37