<el-select v-model="form.cityId" placeholder="请选择" value-key="value">
<el-option
v-for="item in citys"
:key="item.value"
:label="item.label"
:value="item"
/>
</el-select>
:value = ‘item’ 绑定是对象
label是显示的名称
value-key作为 value 唯一标识的键名,绑定值为对象类型时必填