案例:html/html5 案例     状态:可编辑再运行    进入竖版
 运行结果 
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<!DOCTYPE html>
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<html>
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<body>
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<form oninput="x.value=parseInt(a.value)+parseInt(b.value)">0
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<input type="range" id="a" value="50">100
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+<input type="number" id="b" value="50">
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=<output name="x" for="a b"></output>
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</form>
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<p><b>注释:</b>Internet Explorer 不支持 <output> 标签。</p>
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</body>
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</html>
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