用 Claude Code + 腾讯云开发 CloudBase 5 天上线一个 LBS 群聊小程序：技术实录

// 1. groups: 6 个群的元数据
{
  _id: "lu-xun-family",
  name: "鲁迅家族のChat",
  spotId: "luxun-guli",          // 关联打卡景点
  avatarUrl: "...",
  memberIds: ["lu-xun", "zhou-zuoren", "zhu-an", "xu-guangping", "run-tu"],
  unlockOrder: 1                 // 默认开放给所有用户
}

// 2. members: 所有人物角色卡
{
  _id: "lu-xun",
  displayName: "鲁迅",
  age: 48,
  personality: "刻薄敏感爱反讽，写作时抽烟",
  avatarUrl: "...",
  artifactNotes: ["《呐喊》", "线装日记本"]   // 关联可点击的文物
}

// 3. scripts: 群聊剧本（每群 8-15 条，分段解锁）
{
  _id: "lu-xun-family-act1",
  groupId: "lu-xun-family",
  unlockSpotId: "luxun-guli-entrance",   // 在哪个 LBS 点解锁
  messages: [
    { from: "zhou-zuoren", text: "大哥，请你以后不要再到后边院子里来。", type: "text" },
    { from: "zhou-zuoren", text: "[图片]", type: "image", imageUrl: "..." },
    { from: "lu-xun", text: "[已撤回一条消息]", type: "system" },
    { from: "zhu-an", text: "大先生，今天的茴香豆刚买好。", type: "text" },
    // ...
  ]
}

// 4. user_progress: 用户解锁进度
{
  _id: "openid-xxx",
  unlockedScripts: ["lu-xun-family-act1", "shen-yuan-act1"],
  stamps: ["luxun-guli", "shen-yuan"],   // 集章
  reactions: { "lu-xun-family-act1": ["🍶", "🥢"] }
}

// 云函数里取一个群所有已解锁的剧本
const db = cloud.database();
const scripts = await db.collection('scripts')
  .where({
    groupId: 'lu-xun-family',
    unlockSpotId: db.command.in(userProgress.stamps)
  })
  .orderBy('createdAt', 'asc')
  .get();

// 小程序 wx.getLocation
wx.getLocation({
  type: 'gcj02',         // 国测局坐标系，微信小程序原生
  isHighAccuracy: true,  // 高精度模式，5-10m
  success: (res) => {
    wx.cloud.callFunction({
      name: 'unlockSpot',
      data: {
        spotId: 'luxun-guli-entrance',
        userLat: res.latitude,
        userLng: res.longitude
      }
    });
  }
});

// cloudfunctions/unlockSpot/index.js
const cloud = require('wx-server-sdk');
cloud.init({ env: cloud.DYNAMIC_CURRENT_ENV });

const SPOTS = {
  'luxun-guli-entrance': { lat: 30.0021, lng: 120.5797, radius: 100 },
  'shen-yuan': { lat: 29.9924, lng: 120.5871, radius: 100 },
  'lan-ting': { lat: 29.9583, lng: 120.5419, radius: 150 },  // 兰亭范围大，半径放大
  // ...
};

function haversine(lat1, lng1, lat2, lng2) {
  const R = 6371000;  // 地球半径，米
  const toRad = (x) => x * Math.PI / 180;
  const dLat = toRad(lat2 - lat1);
  const dLng = toRad(lng2 - lng1);
  const a = Math.sin(dLat/2) ** 2 +
            Math.cos(toRad(lat1)) * Math.cos(toRad(lat2)) * Math.sin(dLng/2) ** 2;
  return R * 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
}

exports.main = async (event) => {
  const { spotId, userLat, userLng } = event;
  const spot = SPOTS[spotId];
  if (!spot) return { ok: false, reason: 'unknown_spot' };

  const distance = haversine(userLat, userLng, spot.lat, spot.lng);
  if (distance > spot.radius) {
    return { ok: false, reason: 'too_far', distance: Math.round(distance) };
  }

  const { OPENID } = cloud.getWXContext();
  const db = cloud.database();
  await db.collection('user_progress').doc(OPENID).update({
    data: {
      stamps: db.command.addToSet(spotId),
      [`unlockedScripts`]: db.command.addToSet(`${spotId}-act1`)
    }
  });
  return { ok: true };
};

// 前端 page/chat/chat.js
data: {
  inputMode: 'spectator',  // 'spectator' | 'reaction' | 'vote'
  allowedReactions: ['🍶', '🥢', '🪶', '🌧️', '🐢', '🪨']  // 绍兴限定六件套
},

// 用户点击底部输入区
onTapInput() {
  if (this.data.inputMode === 'spectator') {
    wx.showToast({
      title: '默认围观哟，发表情吧',
      icon: 'none'
    });
    return;  // 不弹键盘
  }
}

// cloudfunctions/sendReaction/index.js
exports.main = async (event) => {
  const { scriptId, emoji } = event;
  const db = cloud.database();
  await db.collection('reactions').add({
    data: { scriptId, emoji, createdAt: db.serverDate() }
  });
  // 同步给所有看这条剧本的人（实时推送用 CloudBase Realtime）
  return { ok: true };
};

// cloudfunctions/generateScript/index.js
const cloud = require('wx-server-sdk');
cloud.init({ env: cloud.DYNAMIC_CURRENT_ENV });

exports.main = async (event) => {
  const { groupId, conflictPrompt } = event;

  const ai = cloud.extend.AI;
  const result = await ai.generateText({
    model: 'hunyuan-2.0-instruct-20251111',
    messages: [
      {
        role: 'system',
        content: `你是历史群聊编剧。按"微信群对话"格式输出 10-15 条消息，
每条不超过 30 字，必须包含 [图片] [已撤回] [正在输入] 等微信原生标记，
节奏要有沉默和留白。严格按时间线，不能让人物说出他死后才出现的话。`
      },
      { role: 'user', content: conflictPrompt }
    ]
  });
  return { messages: parseMessages(result.text) };
};