<link rel="stylesheet" href="css/bootstrap.min.css" rel="external nofollow" type="text/css"/>
<script type="text/javascript" src="js/jquery.min.js"></script>
<script type="text/javascript" src="js/bootstrap.min.js"></script> 
<!-- Include the plugin's CSS and JS: -->
<script type="text/javascript" src="js/bootstrap-multiselect.js"></script>
<link rel="stylesheet" href="css/bootstrap-multiselect.css" rel="external nofollow" type="text/css"/>

<!-- Build your select: -->
<select class="multiselect" multiple="multiple">
 <option value="cheese">Cheese</option>
 <option value="tomatoes">Tomatoes</option>
 <option value="mozarella">Mozzarella</option>
 <option value="mushrooms">Mushrooms</option>
 <option value="pepperoni">Pepperoni</option>
 <option value="onions">Onions</option>
</select>

<script type="text/javascript">
 $(document).ready(function() {
  $('.multiselect').multiselect();
 });
</script>

select
$('#cid').multiselect('select', arr[i]); 给控件设置选中项

 $('#cid').val();获取控件所有的选中值