HTML中的下拉菜单选择框select
设置默认值:
<option selected="selected" disabled="disabled" style='display: none' value=''>请选择</option>
如下:
<select>
<option selected="selected" disabled="disabled" style='display: none' value=''>请选择</option>
<option value ="volvo">Volvo</option>
<option value ="saab">Saab</option>
<option value="opel">Opel</option>
<option value="audi">Audi</option>
</select>