The development of online education platforms

uni-app is a cross-platform development framework based on Vue.js, enabling rapid development of multi-terminal applications. The development of an online education platform involves multi-terminal adaptation, real-time interaction, course management, and other functionalities, making uni-app's cross-platform features an ideal choice. Below is a detailed explanation from the perspectives of technical implementation, functional modules, and optimization strategies.

Technical Selection and Project Setup

When using uni-app to develop an online education platform, the first step is to set up the project's foundational structure. Initialize the project using HBuilderX or the command-line tool:

vue create -p dcloudio/uni-preset-vue edu-platform

After selecting the default template, the project directory structure is as follows:

├── pages
│   ├── index
│   ├── course
│   ├── live
├── static
├── components
├── store

Key dependencies include:

• uni-simple-router: Handles cross-platform routing
• uview-ui: Multi-terminal UI component library
• socket.io-client: Supports real-time communication

Core Functional Module Implementation

Course List and Detail Page

The course list uses a waterfall layout, implemented with the uni-list component for high-performance rendering. Example code:

<template>
  <uni-list>
    <uni-list-item 
      v-for="course in courses" 
      :key="course.id"
      :title="course.name"
      :note="`${course.students} students enrolled`"
      clickable
      @click="navToDetail(course.id)"
    >
      <template v-slot:footer>
        <uni-rate :value="course.rating" disabled />
      </template>
    </uni-list-item>
  </uni-list>
</template>

<script>
export default {
  data() {
    return {
      courses: [
        { id: 1, name: 'Vue3 in Action', students: 1245, rating: 4.8 }
      ]
    }
  },
  methods: {
    navToDetail(id) {
      uni.navigateTo({
        url: `/pages/course/detail?id=${id}`
      })
    }
  }
}
</script>

Live Classroom Implementation

Integrate Tencent Cloud TRTC for low-latency live streaming. Key steps:

1. Initialize the SDK:

import TRTC from 'trtc-js-sdk'
const client = TRTC.createClient({
  mode: 'live',
  sdkAppId: 'YOUR_APPID',
  userId: 'teacher_123',
  userSig: 'SIGNATURE'
})

2. Handle dual-stream mode:

// Teacher side
client.setVideoProfile('720p_2')
client.startLocalVideo({ mirror: true })

// Student side
client.on('stream-added', event => {
  const remoteStream = event.stream
  client.subscribe(remoteStream)
})

Offline Caching Strategy

Use uni.getStorageSync to implement local caching of course materials:

// Cache course data
function cacheCourseData(courseId, data) {
  try {
    const cache = uni.getStorageSync('courseCache') || {}
    cache[courseId] = {
      data,
      timestamp: Date.now()
    }
    uni.setStorageSync('courseCache', cache)
  } catch (e) {
    console.error('Caching failed', e)
  }
}

Performance Optimization Solutions

Image Lazy Loading

Optimize first-screen loading with the uni.lazyLoad component:

<template>
  <image 
    lazy-load 
    :src="course.cover" 
    mode="aspectFill"
    @load="handleImageLoad"
  />
</template>

Subpackage Loading Configuration

Configure subpackages in manifest.json:

{
  "subPackages": [
    {
      "root": "pages/live",
      "pages": [
        {"path": "room/index"},
        {"path": "replay/index"}
      ]
    }
  ]
}

Skeleton Screen Implementation

Create components/skeleton.vue:

<template>
  <view class="skeleton-item" v-for="i in 6" :key="i">
    <view class="cover"></view>
    <view class="title"></view>
    <view class="meta"></view>
  </view>
</template>

<style>
.skeleton-item {
  height: 120px;
  margin: 10px;
}
.cover {
  width: 100%;
  height: 70%;
  background: #f2f2f2;
}
</style>

Multi-Terminal Adaptation Techniques

Platform-Specific Conditional Compilation

Handle platform-specific code:

// #ifdef MP-WEIXIN
wx.login({ success() {} })
// #endif

// #ifdef APP-PLUS
uni.login({ provider: 'weixin' })
// #endif

Style Adaptation Solution

Use upx units to ensure consistent dimensions:

.course-card {
  width: 345upx;
  /* Automatically converted to rpx/rem for mini-programs and H5 */
}

Data Security Handling

API Encryption Solution

Add RSA encryption for sensitive APIs:

import JSEncrypt from 'jsencrypt'
const encryptor = new JSEncrypt()
encryptor.setPublicKey('PUBLIC_KEY')

function secureRequest(data) {
  return {
    encrypted: encryptor.encrypt(JSON.stringify(data))
  }
}

Anti-Crawler Strategy

Add dynamic tokens to request headers:

uni.request({
  url: '/api/courses',
  header: {
    'X-Token': md5(`salt_${Date.now()}`)
  }
})

Exception Monitoring System

Frontend Error Collection

Integrate Sentry for error tracking:

import * as Sentry from '@sentry/browser'
Sentry.init({
  dsn: 'YOUR_DSN',
  integrations: [new Sentry.Integrations.Vue({ Vue })]
})

Performance Log Reporting

Record key performance metrics:

const timing = {
  pageLoad: Date.now() - performance.timing.navigationStart,
  firstPaint: 0
}

uni.reportAnalytics('perf_metrics', timing)

Continuous Integration and Deployment

Automated Build Scripts

Configure multi-platform build commands in package.json:

{
  "scripts": {
    "build:mp-weixin": "cross-env NODE_ENV=production UNI_PLATFORM=mp-weixin vue-cli-service uni-build",
    "build:app": "cross-env NODE_ENV=production UNI_PLATFORM=app-plus vue-cli-service uni-build"
  }
}

Cloud Testing Solution

Use WeChat Cloud Testing for compatibility checks:

# cloudbaserc.yaml
plugins:
  - name: 'miniprogram-ci'
    inputs:
      appid: 'wx123456'
      privateKeyPath: './private.key'
      robot: 1
      desc: 'Education platform test build'