事件对象
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<div id="div">
<button id="btn1">按钮</button>
<a id="aid" href="http://www.jikexueyuan.com">极客学院</a>
</div>
<script>
document.getElementById("btn1").addEventListener("click",showType);
document.getElementById("div").addEventListener("click",showDiv);
document.getElementById("aid").addEventListener("click",showA);
function showType(event) {
alert(event.target);
event.stopPropagation();
}
function showDiv() {
alert("div");
}
function showA(event) {
event.stopPropagation();
event.preventDefault();
}
</script>
</body>
</html>