toggleClass通过切换类实现样式变换
<!DOCTYPE html>
<html>
<head>
<script src="https://cdn.staticfile.org/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("p").on("mouseover mouseout",function(){
$("p").toggleClass("intro");
});
});
</script>
<style type="text/css">
.intro
{
font-size:150%;
color:red;
}
</style>
</head>
<body>
<p>Move the mouse pointer over this paragraph.</p>
</body>
</html>