引入庫
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.12.2/css/bootstrap-select.min.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.12.2/js/bootstrap-select.min.js"></script>
例子
<div class="form-group">
<select class="selectpicker " style="width: 400px" multiple placeholder="選擇交辦部門" name="bumen1" >
<option>宣傳部</option><option>政法委</option><option>編辦</option><option>統戰部</option>
</select>
</div>
效果
