jquery动态添加select2

<select name="participant[]" class="form-control input-medium" required >
    <option value="">请选择项目参与人</option>
    <volist name="data['department_user']" id="vo">
        <optgroup label="<{$vo.dept_name}>">
          <volist name="vo['sys_user']" id="user">
            <option value="<{$user['id']}>" ><{$user['realname']}></option>
          </volist>
        </optgroup>
    </volist>
</select>

$('.participant-list').append(participantContent).find('select').select2({
    selectOnClose: true
})