12451 b553c4e519 feat: API 统一 + 设备详情补全 + H5 导航优化
- API 路由统一: 移除 /api/h5/,统一 /api/pms/ 入口
- 二进制改名: api-server -> pms-api(与服务名一致)
- nginx: 合并 /api/ + /pms/api/ 为 /api/pms/
- 新增 docs/API.md 接口文档
- 后端: CabinetDetail 增加 rssi/pow_fail/address/soc 等字段
- Redis 管道批量读取仓体实时数据(SOC/电压/电流/功率)
- DB: 所有 TIMESTAMP 列改为 DATETIME(修复类型不匹配)
- 用户管理: 新增创建时间/修改时间列,状态改用 Switch
- 角色管理/用户管理: 操作按钮改为图标
- PC 设备详情: 基本信息补全 RSSI/ICCID/电源/地址
- PC 卡片: 通道统计改用 Lucide 图标,颜色统一
- PC 二维码: canvas 渲染,含编号文字,支持右键下载
- H5: 按 uni-app 规范修正导航(navigateTo 替代 reLaunch)
- H5: 详情页加返回导航条
- H5: 扫码支持摄像头(jsQR)+ ?id= 参数
- H5: 底部 tabBar 在所有页面常显
- H5: 首页统计改为 6 项(设备/通道/空闲/充电/充满/故障)
- H5: 下拉刷新 / 上拉加载
- 产品首页: 添加业务联系
- 文档: 清理过时文件,补充缺失规范章节
2026-07-04 04:03:02 +08:00

3.5 KiB

title, impact, impactDescription, type, tags
title impact impactDescription type tags
Use immediate Option Instead of Duplicate Initial Call LOW Duplicate code for initial call and watch callback reduces maintainability efficiency
vue3
watch
watchers
immediate
best-practices
DRY

Use immediate Option Instead of Duplicate Initial Call

Impact: LOW - Calling a function manually at setup and also in a watcher leads to duplicate code. The immediate: true option runs the watcher callback immediately with the current value, combining both behaviors.

Task Checklist

  • Use { immediate: true } instead of calling handler in onMounted/created
  • Consider watchEffect as an alternative (always runs immediately)
  • Remember immediate callback receives undefined as oldValue on first run

Incorrect:

<script setup>
import { ref, watch, onMounted } from 'vue'

const userId = ref(1)
const userData = ref(null)

// BAD: Duplicate calls - once in onMounted, once in watch
async function loadUser(id) {
  const response = await fetch(`/api/users/${id}`)
  userData.value = await response.json()
}

onMounted(() => {
  loadUser(userId.value)  // Initial call
})

watch(userId, (newId) => {
  loadUser(newId)  // On change
})
</script>
// Options API - BAD: Duplicate in created and watch
export default {
  data() {
    return { userId: 1, userData: null }
  },
  created() {
    this.loadUser()  // Initial call
  },
  watch: {
    userId() {
      this.loadUser()  // On change - duplicate!
    }
  },
  methods: {
    async loadUser() {
      const response = await fetch(`/api/users/${this.userId}`)
      this.userData = await response.json()
    }
  }
}

Correct:

<script setup>
import { ref, watch } from 'vue'

const userId = ref(1)
const userData = ref(null)

// GOOD: Single watch with immediate runs on mount and on change
watch(
  userId,
  async (newId) => {
    const response = await fetch(`/api/users/${newId}`)
    userData.value = await response.json()
  },
  { immediate: true }
)
</script>
// Options API - GOOD: Using immediate option
export default {
  data() {
    return { userId: 1, userData: null }
  },
  watch: {
    userId: {
      async handler(newId) {
        const response = await fetch(`/api/users/${newId}`)
        this.userData = await response.json()
      },
      immediate: true
    }
  }
}

Alternative: watchEffect

<script setup>
import { ref, watchEffect } from 'vue'

const userId = ref(1)
const userData = ref(null)

// watchEffect always runs immediately - no option needed
watchEffect(async () => {
  const response = await fetch(`/api/users/${userId.value}`)
  userData.value = await response.json()
})
</script>

Handling oldValue on Initial Run

<script setup>
import { ref, watch } from 'vue'

const count = ref(0)

watch(
  count,
  (newVal, oldVal) => {
    // On first run with immediate: true
    // oldVal is undefined
    if (oldVal === undefined) {
      console.log('Initial run, count is:', newVal)
    } else {
      console.log(`Count changed from ${oldVal} to ${newVal}`)
    }
  },
  { immediate: true }
)
</script>

One-Time Watch with once Option

<script setup>
import { ref, watch } from 'vue'

const data = ref(null)

// Run only once when data becomes available
watch(
  data,
  (value) => {
    if (value) {
      initializeWithData(value)
      // Watcher automatically stops after this
    }
  },
  { once: true }
)
</script>

Reference