<optgroup label="Alaskan/Hawaiian Time Zone">
<option value="AK">Alaska</option>
<option value="HI">Hawaii</option>
</optgroup>
转载于:https://www.cnblogs.com/chaoyuehedy/p/6141141.html
<optgroup label="Alaskan/Hawaiian Time Zone">
<option value="AK">Alaska</option>
<option value="HI">Hawaii</option>
</optgroup>
转载于:https://www.cnblogs.com/chaoyuehedy/p/6141141.html