node2:/var/www/html#cat a35.html
<div id="id#b">bb</div>
<div id="id[1]">cc</div>
<div id="aabb">dd</div>
<div id="aabb">ff</div>
<script type="text/javascript" src="jquery-2.2.2.min.js"></script>
<script type="text/javascript" src="a35.js"></script>
node2:/var/www/html#cat a35.js
$('#aabb')
.css("background","#bbffaa");
node2:/var/www/html#
这个时候只有dd这行高亮