<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<title>第一个简单的jQuery程序</title>
<style type="text/css">
div{
padding:8px 0px;
font-size:12px;
text-align:center;
background:#00ffff;
}
.b{background:red;
position:relative;
top:10px;}
</style>
<script src="https://www.imooc.com/static/lib/jquery/1.9.1/jquery.js"></script>
<script type="text/javascript">
$(document).ready(function() {
$(".a").html("您好！");<!--.a和css类选择器类似，即""内就是链接到对应的html标签进行设置-->
});
</script>
</head>
<body>
<div class="a"></div>
<div class="b">ftdr</div>
<script type="text/javascript">
var $div = $('div');
var div = $div.get[0];
div.style.color = 'blue';
</script>
</body>
</html>