<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>id选择器</title>
<style type="text/css">
#dcs{
color: red;
}
</style>
</head>
<body>
<p id="dcs">深圳市多测师信息技术有限公司</p>
<p id="jj">宝安班</p>
</body>
</html>