javascript事件委托//就是父级事件给子级
<!DOCTYPE html>
<html>
<head>
<title></title>
<style type="text/css">
.a{
width:100px;
height:100px;
background:red;
}
</style>
</head>
<body>
<div class="a" ></div>
<script type="text/javascript">
document.onclick=function(e){
var ev=e||event
var iTarget=ev.srcElement||ev.target //srcElement火狐不支持；target ie不支持
if (iTarget.className =='a') {
iTarget.style.background='yellow'
}
}
</script>
</body>
</html>
