elementUI select 显示错误

<el-select v-model="addform1.zone2" value-key="id" @change="getCityByProvinceId(addform1.zone2.id)" placeholder="请选择" style="width:200px;height:30px;margin-left:10px;">
　　<el-option v-for="item in form1.zone2" :key="item.id" :label="item.name" :value="item" style="width:200px;height:30px;">
　　</el-option>
</el-select>

elementUI select value绑定值为obiect是显示错误，给el-select标签加 value-key="id" 属性，同时el-option 的 key值为id即可