两个Select选择器实现联动（vue+element）

<el-select v-model="listQuery.groupId" @change="selectGoodsByGroupId($event)" clearable placeholder="请选择设备组" filterable>
      <el-option v-for="item in deviceGroups" :label="item.groupName" :key="item.id" :value="item.id"></el-option>
    </el-select>
    <el-select v-model="listQuery.goodsId" clearable placeholder="请选择商品" filterable>
      <el-option v-for="item in goods" :label="item.goodsName" :key="item.id" :value="item.id"></el-option>
    </el-select>

//进入列表时先获取所有的设备组   
getAllDevice(){//获取所有的设备组
      getAllDevice()
        .then(response =>{
          this.deviceGroups = response;
        })
    },   

selectGoodsByGroupId(val){//根据设备组id获取相应的商品
      //console.log(val);
      if(val != null && val != '' && val != undefined){
        selectGoodsByGroupId(val)
          .then(response => {
            //给goods数组赋值
            this.goods = response;
          })
      }
    },

/**
     * 根据设备组Id进行获取商品Id进而查询对应的商品信息
     * @param groupId
     * @return
     */
    @RequestMapping(value = "/selectGoodsByGroupId/{groupId}",method = RequestMethod.GET)
    @ResponseBody
    public List<GoodsVo> selectGoodsByGroupId(@PathVariable("groupId") int groupId){
        return baseBiz.selectGoodsByGroupId(groupId);
    }

/**
     * 根据设备组Id进行获取商品Id进而查询对应的商品信息
     * @param groupId
     * @return
     */
    public List<GoodsVo> selectGoodsByGroupId(int groupId){
        return mapper.selectGoodsByGroupId(groupId);
    }

/**
     * 根据设备组Id进行获取商品Id进而查询对应的商品信息
     * @param groupId
     * @return
     */
    List<GoodsVo> selectGoodsByGroupId(@Param("groupId") int groupId);

<!-- 根据设备组Id进行获取商品Id进而查询对应的商品信息 -->
    <select id="selectGoodsByGroupId" resultMap="BaseResultMap">
        select id,goods_name from ue_tb_goods where id in (select goods_id from ue_tb_rs_dg_goods where group_id = #{groupId})
    </select>