类选择器 E.className{
CSS规则 以文档元素的class作为选择符
}
node2:/var/www/html/jquery#cat t8.html
<style>
li.ccc {
font-size:80px;
color:blue;
}
</style>
<td>aaaaaaaaaa</td>
<li class='aaa'>bbbbbbbbb</li>
<li class='bbb'>eeeeeeeee</li>
<li class='ccc'>fffffffff</li>
<li class='aaa'>ggggggggg</li>
<p>ccccccccccc</p>