<span class="bigsize stress">胆小如鼠</span> 与 <span class="stress bigsize">胆小如鼠</span>效果一样
生效顺序与css中样式价值顺序有关，与class list中顺序无关
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>css</title>
<style type="text/css">
.colorred{color:red;}
.colorgreen{color:green;}
</style>
</head>
<body>
<p><span class="colorred colorgreen">colorred colorgreen</span></p>
<p><span class="colorgreen colorred">colorgreen colorred</span></p>
</body>
</html>执行下这个代码就知道了，都是green的
