Vue element-UI el-select循环选中的问题_vue.js

@change="$forceUpdate()" 

<el-checkbox-group v-for="(item,index) in getMonitorAdd" :key='index' v-model="item.userId" >
    <el-checkbox >{{item.userName}}</el-checkbox>
    <el-select v-model="item.arr" @change="$forceUpdate()" placeholder="请选择">
        <el-option v-for="items in userTypeSel" :key="items.id" :label="items.code" :value="items.value"></el-option>
    </el-select>
</el-checkbox-group>

<div class="add_item active">
            <div class="add_name"> 参与者：</div>
            <div class="add_input">
              <el-select v-model="edituser_ids" multiple  filterable placeholder="请选择">
                <el-option v-for="item in addOptions" :key="item.value" :label="item.label" :value="item.value">
                </el-option>
              </el-select>
            </div>
          </div>

this.editmain_user_ids = res.data.data.main_user_ids.split(',').map(Number);