多选

//多选
 ```javascript
<el-checkbox-group v-model="form.checkbox">
                  <el-checkbox
                    v-for="(option,num) in item.options"
                    :label="option.id"
                    :key="option.id"
                    @change="ChangeRadio2(item,index,option,num)"
                  >{{option.content}}</el-checkbox>
</el-checkbox-group>

javascript片段

ChangeRadio2(item, index, open, num) {
     if (this.a[index]) {
       this.a[index].push(open.id);
     } else {
       this.a[index] = [open.id];
     }
     //单选
   //  this.listId[index] = {
   //    itemId: item.id,
    //   optionId: this.a[index]
   //  };
     // console.log(this.listId)
   },