<script type="text/javascript" src="/js/jquery.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$("a").click(function(event){
alert("Default prevented: " + event.isDefaultPrevented());
<a href="http://w3xue.com/">W3xue</a>
<p>preventDefault() 方法将防止上面的链接打开 URL。</p>
<p>请点击该链接,检查是否阻止了默认动作。</p>