实例代码“Ctrl+/”提示“F11/ESC”全屏 返回 格式化 恢复 运行
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<!DOCTYPE html>
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<html>
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<head>
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<script>
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function changeSize()
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{
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document.getElementById("mySelect").size=4;
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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>
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<select id="mySelect">
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  <option>Apple</option>
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  <option>Banana</option>
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  <option>Orange</option>
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  <option>Melon</option>
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</select>
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<input type="button" onclick="changeSize()" value="Change size">
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</form>
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​
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</body>
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</html>