![[javascript]事件冒泡处理](/default/index/img?u=aHR0cDovL2NvbW1vbi5jbmJsb2dzLmNvbS9pbWFnZXMvY29weWNvZGUuZ2lm "[javascript]事件冒泡处理")
<!DOCTYPE html>
<html>
<head>
<style type="text/css">
#box1 {
width: 400px;
height: 400px;
background: #ccc;
}
#box2 {
width: 300px;
height: 300px;
background: #ddd;
}
#box3 {
width: 200px;
height: 200px;
background: #eee;
}
</style>
<script type="text/javascript">
function addEventListener(obj, f, type) {
if (obj.addEventListener) {
obj.addEventListener(type, f, false);
} else {
obj.attachEvent(‘on‘ + type, function(event) {
f.call(obj, event);
});
}
}
function stopPropagation(event) {
if (event.stopPropagation) {
event.stopPropagation();
} else {
event.cancelBubble = true;
}
}
window.onload = function() {
var box1 = document.querySelector(‘#box1‘);
var box2 = document.querySelector(‘#box2‘);
var box3 = document.querySelector(‘#box3‘);
addEventListener(box1, function(event) {
stopPropagation(event);
alert(‘box1‘);
}, ‘click‘);
addEventListener(box2, function(event) {
stopPropagation(event);
alert(‘box2‘);
}, ‘click‘);
addEventListener(box3, function(event) {
stopPropagation(event);
alert(‘box3‘);
}, ‘click‘);
}
</script>
</head>
<body>
<div id="box1">
<div id="box2">
<div id="box3">
</div>
</div>
</div>
</body>
</html>