The use of wepy-redux and storage of global variables in small programs

Wepy recommends using wepy-redux to store global variables

Use

1. Initialize store

// app.wpy
import { setStore } from 'wepy-redux'
import configStore from './store'

const store = configStore()
setStore(store) //setStore是将store注入到所有页面中

// store文件夹下的index.js

import { createStore, applyMiddleware } from 'redux'
import promiseMiddleware from 'redux-promise'
import rootReducer from './reducers'

export default function configStore () {
  const store = createStore(rootReducer, applyMiddleware(promiseMiddleware)) //生成一个 store 对象
  return store
}

applyMiddleware The function of the function is to enhance and transform the store.dispatch method
Here is to use redux-promise to solve the asynchronous problem

2.page to get the store

---

import { getStore } from 'wepy-redux'
 
const store = getStore()

// dispatch
store.dispatch({type: 'xx', payload: data}) //xx是reducer名字 payload就是携带的数据
store.dispatch(getAllHoomInfo(store.getState().base)) //xx是action名字

//获取state
const state = store.getState()

3. Connection component

@connect({
    data:(state) => state.base.data //注意这里是base下的state 所有要加上base.
})

File introduction

redux file

type

Types is the name of the function that triggers the action. It just stores the function name.

Create type.js according to the module

//base.js
export const GETALLHOMEINFO = 'GETALLHOMEINFO'

After writing the function name, export it in index.js

export * from './counter'
export * from './base'

reducers

Follow As the application becomes more complex, the reducer function needs to be split. Each piece after the split is independently responsible for managing a part of the state.
At this time, the reducers of multiple modules are combined into a final reducer through combineReducers Function,

import { combineReducers } from 'redux'
import base from './base'
import counter from './counter'

export default combineReducers({
  base,
  counter
})

module uses handleActions to process the reducer, and writes multiple related reducers together
handleActions There are two parameters: the first is multiple reducers, and the second is the initial state

GETALLHOMEINFO reducer assigns the value returned by the asynchronous action to data

//base.js
import { handleActions } from 'redux-actions'
import { GETALLHOMEINFO } from '../types/base'

const initialState = {
  data: {}
}
export default handleActions({
  [GETALLHOMEINFO] (state, action) {
    return {
      ...state,
      data: action.payload
    }
  }
}, initialState)

actions

actions is the processing of data

Exported in index.js

export * from './counter'
export * from './base'

createAction is used to create Action

import { GETALLHOMEINFO } from '../types/base'
import { createAction } from 'redux-actions'
import { Http, Apis } from '../../libs/interface'

export const getAllHoomInfo = createAction(GETALLHOMEINFO, (base) => {
  return new Promise(async resolve => {
    let data = await Http.get({
      url: Apis.ls_url + Apis.allHomeInfo,
      data: {}
    })
    resolve(data)**//返回到reduer的action.payload**
  })
})

Usage

<script>
  import wepy from &#39;wepy&#39;
  import { connect } from &#39;wepy-redux&#39;
  import { getAllHoomInfo } from &#39;../store/actions/base.js&#39;// 引入action方法
  import { getStore } from &#39;wepy-redux&#39;
 
  const store = getStore()
  
  @connect({
    data:(state) => state.base.data
  })

  export default class Index extends wepy.page {
    data = {
    }

    computed = {
    }

    onLoad() {
      store.dispatch(getAllHoomInfo(store.getState().base))
    }
    
  }
</script>

Recommended tutorial: "WeChat Mini Program"

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