案例：javascript案例     状态：可编辑再运行    进入竖版
 运行结果　
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<html>
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<head>
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<style type="text/css">
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a:active {color:green}
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</style>
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​
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<script type="text/javascript">
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function getfocus()
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{document.getElementById('myAnchor').focus()}
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​
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function losefocus()
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{document.getElementById('myAnchor').blur()}
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</script>
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</head>
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​
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<body>
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<a id="myAnchor" href="//www.w3xue.com">访问 W3xue.com</a>
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<br /><br/>
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<input type="button" onclick="getfocus()" value="获得焦点">
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<input type="button" onclick="losefocus()" value="失去焦点">
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</body>
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​
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</html>