feat: 支持章节通过 mid 进行访问，优化阅读跳转逻辑。新增章节数据结构，包含章节的 mid 信息，提升用户体验。更新 API 以支持通过 mid 查询章节内容，确保兼容性与灵活性。

miniprogram/pages/index/index.js

@@ -7,6 +7,7 @@
 console.log('[Index] ===== 首页文件开始加载 =====')
 
 const app = getApp()
+const PART_NUMBERS = { 'part-1': '一', 'part-2': '二', 'part-3': '三', 'part-4': '四', 'part-5': '五' }
 
 Page({
   data: {
@@ -19,31 +20,13 @@ Page({
     hasFullBook: false,
     readCount: 0,
     
-    // 书籍数据
     totalSections: 62,
     bookData: [],
-    
-    // 推荐章节
-    featuredSections: [
-      { id: '1.1', title: '荷包：电动车出租的被动收入模式', tag: '免费', tagClass: 'tag-free', part: '真实的人' },
-      { id: '3.1', title: '3000万流水如何跑出来', tag: '热门', tagClass: 'tag-pink', part: '真实的行业' },
-      { id: '8.1', title: '流量杠杆:抖音、Soul、飞书', tag: '推荐', tagClass: 'tag-purple', part: '真实的赚钱' }
-    ],
-    
-    // 最新章节（动态计算）
+    featuredSections: [],
     latestSection: null,
     latestLabel: '最新更新',
-    
-    // 内容概览
-    partsList: [
-      { id: 'part-1', number: '一', title: '真实的人', subtitle: '人与人之间的底层逻辑' },
-      { id: 'part-2', number: '二', title: '真实的行业', subtitle: '电商、内容、传统行业解析' },
-      { id: 'part-3', number: '三', title: '真实的错误', subtitle: '我和别人犯过的错' },
-      { id: 'part-4', number: '四', title: '真实的赚钱', subtitle: '底层结构与真实案例' },
-      { id: 'part-5', number: '五', title: '真实的社会', subtitle: '未来职业与商业生态' }
-    ],
-    
-    // 加载状态
+    partsList: [],
+    prefaceMid: 0,
     loading: true
   },
 
@@ -98,10 +81,7 @@ Page({
     this.setData({ loading: true })
     
     try {
-      // 获取书籍数据
       await this.loadBookData()
-      // 计算推荐章节
-      this.computeLatestSection()
     } catch (e) {
       console.error('初始化失败:', e)
     } finally {
@@ -109,62 +89,82 @@ Page({
     }
   },
 
-  // 计算推荐章节（根据用户ID随机、优先未付款）
-  computeLatestSection() {
-    const { hasFullBook, purchasedSections } = app.globalData
-    const userId = app.globalData.userInfo?.id || wx.getStorageSync('userId') || 'guest'
-    
-    // 所有章节列表
-    const allSections = [
-      { id: '9.14', title: '大健康私域：一个月150万的70后', part: '真实的赚钱' },
-      { id: '9.13', title: 'AI工具推广：一个隐藏的高利润赛道', part: '真实的赚钱' },
-      { id: '9.12', title: '美业整合：一个人的公司如何月入十万', part: '真实的赚钱' },
-      { id: '8.6', title: '云阿米巴:分不属于自己的钱', part: '真实的赚钱' },
-      { id: '8.1', title: '流量杠杆:抖音、Soul、飞书', part: '真实的赚钱' },
-      { id: '3.1', title: '3000万流水如何跑出来', part: '真实的行业' },
-      { id: '5.1', title: '拍卖行抱朴：一天240万的摇号生意', part: '真实的行业' },
-      { id: '4.1', title: '旅游号:30天10万粉的真实逻辑', part: '真实的行业' }
-    ]
-    
-    // 用户ID生成的随机种子（同一用户每天看到的不同）
-    const today = new Date().toISOString().split('T')[0]
-    const seed = (userId + today).split('').reduce((a, b) => a + b.charCodeAt(0), 0)
-    
-    // 筛选未付款章节
-    let candidates = allSections
-    if (!hasFullBook) {
-      const purchased = purchasedSections || []
-      const unpurchased = allSections.filter(s => !purchased.includes(s.id))
-      if (unpurchased.length > 0) {
-        candidates = unpurchased
-      }
-    }
-    
-    // 根据种子选择章节
-    const index = seed % candidates.length
-    const selected = candidates[index]
-    
-    // 设置标签（如果有新增章节显示"最新更新"，否则显示"推荐阅读"）
-    const label = candidates === allSections ? '推荐阅读' : '为你推荐'
-    
-    this.setData({
-      latestSection: selected,
-      latestLabel: label
-    })
-  },
-
-  // 加载书籍数据
   async loadBookData() {
     try {
-      const res = await app.request('/api/miniprogram/book/all-chapters')
-      if (res && res.data) {
-        this.setData({
-          bookData: res.data,
-          totalSections: res.totalSections || 62
+      const [chaptersRes, hotRes] = await Promise.all([
+        app.request('/api/miniprogram/book/all-chapters'),
+        app.request('/api/miniprogram/book/hot')
+      ])
+      const list = chaptersRes?.data || []
+      const hotList = hotRes?.data || []
+      app.globalData.bookData = list
+
+      const toSection = (ch) => ({
+        id: ch.id,
+        mid: ch.mid || 0,
+        title: ch.sectionTitle || ch.chapterTitle || ch.id,
+        part: ch.partTitle || ''
+      })
+
+      let featuredSections = []
+      if (hotList.length >= 3) {
+        const freeCh = list.find(c => c.isFree || c.id === '1.1' || c.id === 'preface')
+        const picks = []
+        if (freeCh) picks.push({ ...toSection(freeCh), tag: '免费', tagClass: 'tag-free' })
+        hotList.slice(0, 3 - picks.length).forEach((ch, i) => {
+          if (!picks.find(p => p.id === ch.id)) {
+            picks.push({ ...toSection(ch), tag: i === 0 ? '热门' : '推荐', tagClass: i === 0 ? 'tag-pink' : 'tag-purple' })
+          }
         })
+        featuredSections = picks.slice(0, 3)
       }
+      if (featuredSections.length < 3 && list.length > 0) {
+        const fallback = list.filter(c => c.id && !['preface', 'epilogue'].includes(c.id)).slice(0, 3)
+        featuredSections = fallback.map((ch, i) => ({
+          ...toSection(ch),
+          tag: ch.isFree ? '免费' : (i === 0 ? '热门' : '推荐'),
+          tagClass: ch.isFree ? 'tag-free' : (i === 0 ? 'tag-pink' : 'tag-purple')
+        }))
+      }
+
+      const partMap = {}
+      list.forEach(ch => {
+        if (!ch.partId || ch.id === 'preface' || ch.id === 'epilogue' || (ch.id || '').startsWith('appendix')) return
+        if (!partMap[ch.partId]) {
+          partMap[ch.partId] = { id: ch.partId, number: PART_NUMBERS[ch.partId] || ch.partId, title: ch.partTitle || ch.partId, subtitle: ch.chapterTitle || '' }
+        }
+      })
+      const partsList = Object.values(partMap).sort((a, b) => (a.id || '').localeCompare(b.id || ''))
+
+      const paidCandidates = list.filter(c => c.id && !['preface', 'epilogue'].includes(c.id) && !(c.id || '').startsWith('appendix') && c.partId)
+      const { hasFullBook, purchasedSections } = app.globalData
+      let candidates = paidCandidates
+      if (!hasFullBook && purchasedSections?.length) {
+        const unpurchased = paidCandidates.filter(c => !purchasedSections.includes(c.id))
+        if (unpurchased.length > 0) candidates = unpurchased
+      }
+      const userId = app.globalData.userInfo?.id || wx.getStorageSync('userId') || 'guest'
+      const today = new Date().toISOString().split('T')[0]
+      const seed = (userId + today).split('').reduce((a, b) => a + b.charCodeAt(0), 0)
+      const selectedCh = candidates[seed % Math.max(candidates.length, 1)]
+      const latestSection = selectedCh ? { ...toSection(selectedCh), mid: selectedCh.mid || 0 } : null
+      const latestLabel = candidates.length === paidCandidates.length ? '推荐阅读' : '为你推荐'
+
+      const prefaceCh = list.find(c => c.id === 'preface')
+      const prefaceMid = prefaceCh?.mid || 0
+
+      this.setData({
+        bookData: list,
+        totalSections: list.length || 62,
+        featuredSections,
+        partsList,
+        latestSection,
+        latestLabel,
+        prefaceMid
+      })
     } catch (e) {
       console.error('加载书籍数据失败:', e)
+      this.setData({ featuredSections: [], partsList: [], latestSection: null })
     }
   },
 
@@ -189,10 +189,11 @@ Page({
     wx.navigateTo({ url: '/pages/search/search' })
   },
 
-  // 跳转到阅读页
   goToRead(e) {
     const id = e.currentTarget.dataset.id
-    wx.navigateTo({ url: `/pages/read/read?id=${id}` })
+    const mid = e.currentTarget.dataset.mid || app.getSectionMid(id)
+    const q = mid ? `mid=${mid}` : `id=${id}`
+    wx.navigateTo({ url: `/pages/read/read?${q}` })
   },
 
   // 跳转到匹配页