代码示例:(标识:event_defaultprevented)
<!DOCTYPE html>
<html>
<body>

<a id="myAnchor" href="https://wwww.sou-xun.com/">访问 sou-xun.com</a>

<p>preventDefault() 方法将阻止上面的链接跟随 URL。</p>

<p>请单击链接并检查是否阻止了默认操作。</p>

<script>
document.getElementById("myAnchor").addEventListener("click", function(event){
  event.preventDefault()
  alert("Was preventDefault() called: " + event.defaultPrevented);
});
</script>

</body>
</html>
运行结果: