導入jquery文件
<script type="text/javascript" src="js/jquery-1.7.2.js"></script>
<!--<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.8/jquery.min.js"></script>-->helloworld.html
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<script type="text/javascript" src="js/jquery-1.7.2.js"></script>
<!--<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.8/jquery.min.js"></script>-->
<script type="text/javascript">
$(document).ready(function(){
$("p").click(function(){
$(this).hide();
});
});
</script>
</head>
<body>
<p>If you click on me, I will disappear.</p>
</body>
</html>