el-tabs

   <el-tabs v-model="activeName" class="demo-tabs" @tab-click="openloginfodell">
                    <template v-for="(item, index) in loginfo" :key="index">
                        <el-tab-pane :label="item.Instance" :name="index"></el-tab-pane>

                    </template>

                </el-tabs>

　　

const activeName = ref(0);

function openloginfodell(item) {

    ruleForm.value=loginfo.value[item.index]
}