案例：HTML DOM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 makeCheck(thisForm)
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{
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for (i = 0; i < thisForm.option.length; i++)
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    {
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    thisForm.option[i].checked=true
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    }
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}
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​
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function makeUncheck(thisForm)
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{
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for (i = 0; i < thisForm.option.length; i++)
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    {
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    thisForm.option[i].checked=false
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    }
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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 name="myForm">
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<input type="button" value="选取" onclick="makeCheck(this.form)">
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<input type="button" value="取消" onclick="makeUncheck(this.form)">
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<br />
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<input type="checkbox" name="option">苹果<br />
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<input type="checkbox" name="option">桔子<br />
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<input type="checkbox" name="option">香蕉<br />
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<input type="checkbox" name="option">西瓜
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</form>
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​
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</body>
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</html>
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​