问题描述

百度在基础库3.70.x改动了生命周期，并在后面一些版本有回退。Taro的页面在使用旧生命周期的基础库上运行报错，页面白屏。

复现步骤

1. 将任意Taro项目编译到百度
2. 在IDE中打开，选择基础库版本3.80.34
3. 查看控制台有报错，页面白屏

期望行为

页面无兼容性问题，在新/旧生命周期的基础库环境下，都可以正常展示

报错信息

TypeError: Cannot read property '$router' of undefined
    at Object.weappComponentConf.methods.onLoad (taro.js:1258)
    at f (index.js:1)
    at Object.<anonymous> (index.js:1)
    at Object._onReady (index.js:1)
    at Object.rendered (index.js:1)
    at e.value (index.js:1)
    at e.value (index.js:1)
    at index.js:1
    at Array.forEach (<anonymous>)
    at t.slaveCommunicator.onMessage.listenPreviousEvent (index.js:1)

系统信息

Taro CLI 2.1.5 environment info:
    System:
      OS: macOS 10.15.4
      Shell: 5.7.1 - /bin/zsh
    Binaries:
      Node: 12.16.1 - ~/.nvm/versions/node/v12.16.1/bin/node
      Yarn: 1.22.4 - /usr/local/bin/yarn
      npm: 6.13.4 - ~/.nvm/versions/node/v12.16.1/bin/npm
    npmPackages:
      @tarojs/cli: 2.1.5 => 2.1.5
      @tarojs/components: 2.1.5 => 2.1.5
      @tarojs/components-qa: 2.1.5 => 2.1.5
      @tarojs/mini-runner: 2.1.5 => 2.1.5
      @tarojs/plugin-babel: 2.1.5 => 2.1.5
      @tarojs/plugin-csso: 2.1.5 => 2.1.5
      @tarojs/plugin-sass: 2.1.5 => 2.1.5
      @tarojs/plugin-uglifyjs: 2.1.5 => 2.1.5
      @tarojs/redux: 2.1.5 => 2.1.5
      @tarojs/redux-h5: 2.1.5 => 2.1.5
      @tarojs/router: 2.1.5 => 2.1.5
      @tarojs/taro: 2.1.5 => 2.1.5
      @tarojs/taro-alipay: 2.1.5 => 2.1.5
      @tarojs/taro-h5: 2.1.5 => 2.1.5
      @tarojs/taro-qq: 2.1.5 => 2.1.5
      @tarojs/taro-quickapp: 2.1.5 => 2.1.5
      @tarojs/taro-rn: 2.1.5 => 2.1.5
      @tarojs/taro-swan: 2.1.5 => 2.1.5
      @tarojs/taro-tt: 2.1.5 => 2.1.5
      @tarojs/taro-weapp: 2.1.5 => 2.1.5
      @tarojs/webpack-runner: 2.1.5 => 2.1.5
      eslint-config-taro: 2.1.5 => 2.1.5
      eslint-plugin-taro: 2.1.5 => 2.1.5
      nerv-devtools: ^1.5.6 => 1.5.6
      nervjs: ^1.5.6 => 1.5.6
      stylelint-config-taro-rn: 2.1.5 => 2.1.5
      stylelint-taro-rn: 2.1.5 => 2.1.5

补充信息

关于百度生命周期更改的公告： https://smartprogram.baidu.com/forum/topic/show/70128

如果您有功能上的建议，可以提到 FeatHub

使用上的问题，欢迎在「Taro 社区」一起交流