<el-select @change="orgChange" v-model="sectionNameOpt" filterable placeholder="">
    <el-option
        v-for="item in sectionNameOpts"
        :key="item.index"
        :label="item.orgName"
        :value="item.orgId">
    </el-option>
</el-select>

where sectionNameOpts is the data returned by the background; it can be selected in the test environment . But after production environment , you can"t get the first value! What is the reason, please? Is it because of key?