案例：javascript案例     状态：可编辑再运行    进入横版
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<html>
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<head>
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<script type="text/javascript">
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function setFocus()
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  {
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  document.getElementById('check1').focus()
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  }
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function loseFocus()
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  {
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  document.getElementById('check1').blur()
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  }
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</script>
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</head>
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<body>
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​
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<form>
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<input type="checkbox" id="check1" />
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<br />
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<input type="button" onclick="setFocus()" value="Set focus" />
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<input type="button" onclick="loseFocus()" value="Lose focus" />
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</form>
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​
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</body>
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</html>

 运行结果　
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