``` <form > <div class="form-group"> <select class="form-control"> <option value="武漢">武漢</option> <option value="長沙">長沙</option> <option value="貴陽">貴陽</option> </select> </div> </form> ``` ``` form div class="form-group" select class="form-control" ```  ``` <form action="" > <div class="form-group"> <select class="form-control" multiple> <option value="武漢">武漢</option> <option value="長沙">長沙</option> <option value="貴陽">貴陽</option> </select> </div> </form> ``` 顯示如下