<title>:focusable Selector 实例</title>
<link rel="stylesheet" href="//apps.bdimg.com/libs/jqueryui/1.10.4/css/jquery-ui.min.css">
<script src="//apps.bdimg.com/libs/jquery/1.10.2/jquery.min.js"></script>
<script src="//apps.bdimg.com/libs/jqueryui/1.10.4/jquery-ui.min.js"></script>
<div><input value="文本输入"></div>
<div><a>不带有 href 的锚</a></div>
<div><a href="#">带有 href 的锚</a></div>
<div><p>不带有 tabindex 的段落</p></div>
<div><p tabindex="1">带有 tabindex 的段落</p></div>
$( ":focusable" ).css( "border-color", "red" );
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