easyui-combobox 下拉菜单 多选 multiple

<select class="easyui-combobox" id=‘select_product_name‘ name=‘select_product_name‘  data-options="multiple:true" style="width:140px;" editable=false><{$option_select_product_name}></select>

var product_name=$(‘#select_product_name‘).combobox(‘getText‘);

$option="<option value=‘0‘></option>" . $option;
$option.="<option value=‘1‘>可乐</option>" ;
$option.="<option value=‘2‘>雪碧</option>" ;
$option.="<option value=‘3‘>冰红荼</option>" ;
$smarty->assign(‘option_select_product_name‘,$option);