~~~
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<ul>
<li>1111</li>
<li>1111</li>
<li>1111</li>
<li>1111</li>
</ul>
<script type="text/javascript" src="js/jquery-1.11.1.js"></script>
<script>
$('li').css('background','red');
jQuery('li').css('border','1px solid #000');
// $ == jQuery，小名大名的關系
</script>
</body>
</html>
~~~
