html option禁用选择 select禁用选项示例

<select>
<option value="">1</option>
<option value="">2</option>
<option value="">3</option>
<option value="">4</option>
<option value="">5</option>
</select>

<select>
<option value="">1</option>
<option value="">2</option>
<optgroup label="3"></optgroup>
<optgroup label="4"></optgroup>
<optgroup label="5"></optgroup>
</select>