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taro 升级采坑 ​

Taro.getSystemInfoSync()获取不到值 .getSystemInfoSync is not a function ​

原因：

依赖版本不一致的问题

json
{
   "@tarojs/components": "^3.0.0-alpha.5",
    "@tarojs/runtime": "^3.0.0-alpha.5",
    "@tarojs/taro": "^3.0.0-alpha.5",
   "@tarojs/mini-runner": "^3.0.0-alpha.5",
    "@tarojs/webpack-runner": "^3.0.0-alpha.5",
    "babel-preset-taro": "^3.0.0-alpha.5",
    "eslint-config-taro": "^3.0.0-alpha.5",
}

banban is not defined ​

Config/index.js

defineConstants配置里的全局变量编译时会被去掉引号 如版本号’1.0.0‘编译成1.0.0 ‘banban’ 编译成 banban 导致报错 语法不对或变量找不到

临时解决，全局的变量临时赋值字符串

Super expression must either be null or a function ​

页面没有替换成react

js
import React, { Component } from 'react'
import Taro, { getCurrentInstance } from '@tarojs/taro'
import { Button, Image, Text, View } from '@tarojs/components'

Cannot set property '_code' of undefined ​

ReferenceError: this hasn't been initialised - super() hasn't been called ​

解决： 组件构造函数必须调用父类的构造函数 super()

js
//...
constructor() {
    super()
    this._code = null
    this._first = true
    this._reLunched = false
}
//...

react.ts:53 TypeError: Cannot read property 'params' of undefined ​

解决：新路由方式

js
import Taro ,{getCurrentInstance} from '@tarojs/taro'
//...
constructor(props) {
    super(props)
    this.$router  = getCurrentInstance().router
}
//...

Block is not defined ​

ReferenceError: Image is not defined ​

标签未导入

js
import { Block, Image } from '@tarojs/components'

VM1519:6 Uncaught Error: APP-SERVICE-Engine:Please do not call Page constructor in files that not listed in "pages" section of app.json or plugin.json ​

页面没有注册的原因

Uncaught TypeError: Cannot assign to read only property 'exports' of object '#<Object>' ​

wepack升级为4.x不在支持require()

解决：对应的文件改为es模式导出

<slot> 似乎不在支持？ ​

https://zhuanlan.zhihu.com/p/75606138

使用 this.$props.children 代替

Taro.createRef替换成React.createRef() ​

调用实例的方法沿用以前会存在找不到的方法，

使用同react如下示例加.current

this.listPageRef.current._getMoreListData();