<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>js冒泡事件</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<div class="container">
<h1>js冒泡事件分析</h1>
<hr>
<div class="box bg-gray">
<button class="btn">
Click me !
</button>
</div>
</div>
<script>
var box=document.querySelector(".box"),
btn=document.querySelector(".btn");
box.onclick=function(event){
alert("我是div");
}
btn.onclick=function(event){
alert("我是button");
}
</script>
</body>
</html>
當(dāng)點(diǎn)擊按鈕時會彈出“我是button”再彈出“我是div”,因?yàn)橄扔|發(fā)按鈕事件之后觸發(fā)下一層div點(diǎn)擊事件，
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>js冒泡事件</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<div class="container">
<h1>js冒泡事件分析</h1>
<hr>
<div class="box bg-gray">
<button class="btn">
Click me !
</button>
<a href="
</div>
</div>
<script>
var box=document.querySelector(".box"),
btn=document.querySelector(".btn");
box.onclick=function(event){
alert("我是div");
}
btn.onclick=function(event){
alert("我是button");
event.stopPropagation();
}
document.getElementById('link').onclick=function(event){
alert("我是link");
event.preventDefault();
}
/*區(qū)分event.stopPropagation();和event.preventDefault();
前者使用stopPropagation()方法阻止事件冒泡
后者是阻止默認(rèn)的行為比如阻止超鏈接
*/
</script>
</body>
</html>
