  <li><a href="javascript:;" @click="setBookMemberRole(item.member_id,2)">编辑者</a> </li>
                                                   <li><a href="javascript:;" @click="setBookMemberRole(item.member_id,3)">观察者</a> </li>
                                               </ul>
                                           </div>
                                           <button type="button" class="btn btn-danger btn-sm" @click="removeBookMember(item.member_id)">移除</button>
                   