在线运行代码 - 菜鸟教程

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>:focusable Selector 实例</title>
  <link rel="stylesheet" href="https://apps.bdimg.com/libs/jqueryui/1.10.4/css/jquery-ui.min.css">
  <style>input, a, p {
    border: 1px solid #000;
  }
  div {
    padding: 5px;
  }
  </style>
  <script src="https://apps.bdimg.com/libs/jquery/1.10.2/jquery.min.js"></script>
  <script src="https://apps.bdimg.com/libs/jqueryui/1.10.4/jquery-ui.min.js"></script>
</head>
<body>
 
<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>
 
<script>
$( ":focusable" ).css( "border-color", "red" );
</script>
 
</body>
</html>
源代码

动行结果
