案例：javascript案例     状态：可编辑再运行    进入竖版
 运行结果　
​x
 
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<html>
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<body>
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​
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<form>
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Male: <input id="male" alt="male" type="radio" name="Sex" value="Male" />
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<br />
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Female: <input id="female" alt="female" type="radio" name="Sex" value="Female" />
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</form>
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​
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<p>The alt text for the radio buttons are:
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<script type="text/javascript">
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document.write(document.getElementById('male').alt);
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document.write(" and ");
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document.write(document.getElementById('female').alt);
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</script></p>
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​
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</body>
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</html>
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​