el-select的value传对象时，选中的问题

<el-select
            v-model="selectBrand"
            value-key="id"
            filterable
            remote
            reserve-keyword
            clearable
            placeholder="品牌名称/编号"
            :remote-method="remoteMethodBrand"
            @change="brandChange"
          >
            <el-option v-for="item in optionsBrand" :key="item.id" :label="item.fullNmae" :value="item"></el-option>
          </el-select>

在el-select中增加     value-key="id