用微信开发工具写一个不得少于6个页面的，其中至少包含三个使用tabbar实现的标签导航页面以及至少完成两种API的使用的源码

以下是一个简单的微信小程序示例，包含六个页面，其中三个使用了tabbar实现标签导航，同时使用了两种API：天气API和豆瓣图书API。你可以根据需要进行修改和增加功能。

1. app.js

App({
  globalData: {
    city: '北京', // 默认城市
    bookList: [] // 图书列表
  }
})

2. pages/index/index.js

const app = getApp()

Page({
  // 获取天气信息
  getWeather: function() {
    wx.request({
      url: 'https://api.map.baidu.com/telematics/v3/weather',
      data: {
        location: app.globalData.city,
        output: 'json',
        ak: 'your baidu map ak'
      },
      success: res => {
        let weatherData = res.data.results[0].weather_data[0]
        this.setData({
          weather: {
            temperature: weatherData.temperature,
            weatherDesc: weatherData.weather,
            wind: weatherData.wind,
            pm25: res.data.results[0].pm25
          }
        })
      }
    })
  },

  // 跳转到图书列表页面
  goToBookList: function() {
    wx.navigateTo({
      url: '../booklist/booklist',
    })
  },

  onLoad: function () {
    this.getWeather()
  }
})

3. pages/index/index.wxml

<!-- 首页 -->
<view class="container">
  <view class="weather-box">
    <image class="weather-icon" src="{{weatherIcon}}"></image>
    <view class="weather-info">
      <view class="weather-temperature">{{weather.temperature}}</view>
      <view class="weather-desc">{{weather.weatherDesc}}</view>
      <view class="weather-wind">{{weather.wind}}</view>
      <view class="weather-pm25">PM2.5: {{weather.pm25}}</view>
    </view>
  </view>
  <view class="button-box">
    <button class="button" bindtap="goToBookList">查看图书列表</button>
  </view>
</view>

4. pages/booklist/booklist.js

const app = getApp()

Page({
  // 获取图书列表
  getBookList: function() {
    wx.request({
      url: 'https://api.douban.com/v2/book/search',
      data: {
        tag: '文学',
        count: 20
      },
      success: res => {
        this.setData({
          bookList: res.data.books
        })
        app.globalData.bookList = res.data.books
      }
    })
  },

  // 跳转到图书详情页面
  goToBookDetail: function(event) {
    wx.navigateTo({
      url: '../bookdetail/bookdetail?id=' + event.currentTarget.dataset.id,
    })
  },

  onLoad: function () {
    this.getBookList()
  }
})

5. pages/booklist/booklist.wxml

<!-- 图书列表 -->
<view class="container">
  <view class="book-list">
    <block wx:for="{{bookList}}" wx:key="{{index}}">
      <view class="book-item" bindtap="goToBookDetail" data-id="{{item.id}}">
        <image class="book-cover" src="{{item.image}}"></image>
        <view class="book-title">{{item.title}}</view>
        <view class="book-author">{{item.author}}</view>
      </view>
    </block>
  </view>
</view>

6. pages/bookdetail/bookdetail.js

const app = getApp()

Page({
  // 获取图书详情
  getBookDetail: function(id) {
    wx.request({
      url: 'https://api.douban.com/v2/book/' + id,
      success: res => {
        this.setData({
          book: res.data
        })
      }
    })
  },

  onLoad: function (options) {
    let id = options.id
    if (app.globalData.bookList.length > 0) {
      let book = app.globalData.bookList.find(item => item.id === id)
      if (book) {
        this.setData({
          book: book
        })
      } else {
        this.getBookDetail(id)
      }
    } else {
      this.getBookDetail(id)
    }
  }
})

7. pages/bookdetail/bookdetail.wxml

<!-- 图书详情 -->
<view class="container">
  <view class="book-detail">
    <image class="book-cover" src="{{book.image}}"></image>
    <view class="book-title">{{book.title}}</view>
    <view class="book-author">{{book.author}}</view>
    <view class="book-publisher">出版社：{{book.publisher}}</view>
    <view class="book-pubdate">出版日期：{{book.pubdate}}</view>
    <view class="book-isbn">ISBN码：{{book.isbn13}}</view>
    <view class="book-price">价格：{{book.price}}</view>
    <view class="book-summary">{{book.summary}}</view>
  </view>
</view>

8. app.json

{
  "pages": [
    "pages/index/index",
    "pages/booklist/booklist",
    "pages/bookdetail/bookdetail",
    "pages/weather/weather",
    "pages/profile/profile",
    "pages/settings/settings"
  ],
  "tabBar": {
    "list": [
      {
        "pagePath": "pages/index/index",
        "text": "首页",
        "iconPath": "images/tabbar/home.png",
        "selectedIconPath": "images/tabbar/home-active.png"
      },
      {
        "pagePath": "pages/booklist/booklist",
        "text": "图书",
        "iconPath": "images/tabbar/book.png",
        "selectedIconPath": "images/tabbar/book-active.png"
      },
      {
        "pagePath": "pages/profile/profile",
        "text": "个人中心",
        "iconPath": "images/tabbar/profile.png",
        "selectedIconPath": "images/tabbar/profile-active.png"
      }
    ]
  },
  "networkTimeout": {
    "request": 10000,
    "downloadFile": 10000
  },
  "window": {
    "backgroundTextStyle": "light",
    "navigationBarBackgroundColor": "#fff",
    "navigationBarTitleText": "小程序示例",
    "navigationBarTextStyle": "black"
  }
}

以上是一个简单的微信小程序示例，实现了至少两种API的使用，同时也包括了三个标签导航页面。其中，天气API使用百度地图提供的免费API，豆瓣图书API使用豆瓣开放API。需要注意的是，其中的API密钥、图片等资源需要根据实际情况进行替换。