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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<script type="text/javascript">
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function check()
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{
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document.getElementById("myCheck").checked=true
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}
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​
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function uncheck()
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{
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document.getElementById("myCheck").checked=false
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}
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</script>
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</head>
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​
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<body>
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<form>
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<input type="checkbox" id="myCheck" />
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<input type="button" onclick="check()" value="选定复选框" />
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<input type="button" onclick="uncheck()" value="取消选定复选框" />
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</form>
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</body>
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​
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</html>
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​