node2:/var/www/html/js#cat h33.html
<style type="text/css">
.aaaa{
color:green;
}
.bbbb {
color:red;
}
.cccc{
color:yellow;
}
.dddd{
height:100px;
font-size:100px;
}
.ffff{
font-family:'STFangsong';
}
</style>
<h1 class="aaaa dddd ffff">泰隆银行</h1>
<h1 class="bbbb">杭州银行</h1>
<h1 class="cccc">稠州银行</h1>
<script type="text/javascript" src="jquery-2.2.2.min.js"></script>
<script type="text/javascript" src="h33.js"></script>
node2:/var/www/html/js#
node2:/var/www/html/js#cat h33.js
$('.bbbb').addClass('height:100px');
![](https://img-blog.csdnimg.cn/20190212153321727.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW95YW5namlhbjcyNA==,size_16,color_FFFFFF,t_70)
![](https://img-blog.csdnimg.cn/20190212153333385.PNG?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW95YW5namlhbjcyNA==,size_16,color_FFFFFF,t_70)