事件对象
事件冒泡
事件冒泡是事件被定义为从最具体的元素开始触发,然后向上传播值没有那么具体的元素。
阻止冒泡的方法
IE方法: 其他浏览器也生效
window.event.cancelBubble=true
document方法:IE8以前不生效
event.stopPropagation()
js
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
#box {
width: 100px;
height: 100px;
background-color: aquamarine;
}
</style>
<script>
window.onload = function() {
var odiv = document.getElementById('box');
odiv.onclick = function(e) {
alert('odiv');
var e = window.event || e
// e.stopPropagation();
e.cancelBubble = true;
}
document.onclick = function(e) {
alert('document');
}
}
</script>
</head>
<body>
<div id="box">
</div>
</body>
</html>
==注意:==blur,focus,load,unload不会事件冒泡