案例：html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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​
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<p>
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Depending on browser support:<br>
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Fixed steps will apply in the input field.
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</p>
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​
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<form action="/example/html/form_action.aspx">
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  Quantity:
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  <input type="number" name="points"
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   min="0" max="100" step="10" value="30">
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  <input type="submit">
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</form>
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​
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<p><b>Note:</b>type="number" is not supported in IE9 and earlier.
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</p>
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​
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</body>
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</html>