教你如何在项目中如何将Redux写法更方便，更好维护

因每个页面都有所关联的，请将所有页面新建或修改完毕，再运行

1. 安装 Redux

　npm install --save redux

2. 安装React-Redux

  npm install --save react-redux

3.修改src/index.js

/*
  @Provider: 提供器-可以直接使用store
  @store: 将src/store/index.js 引用
*/

import React from 'react';
import ReactDOM from 'react-dom';
import store from './store'
import TodeList from './TodeList';
import { Provider } from 'react-redux'

const App = (
  <Provider store={store}>
    <TodeList />
  </Provider>
)

ReactDOM.render(App, document.getElementById('root'));

2. 创建/src/store/index.js

import { createStore } from 'redux'
import reducer from './reducer'

// 创建store库
const store = createStore(reducer)

export default store

　　

3. 创建/src/store/reducer.js

import { CHANGE_INPUT, ADD_ITEM, DEL_ITEM } from './actionType'

const defaultState = {
  inputVal: 'hahah',
  list: []
}

/* 
  @state=defaultState:默认store定义值
  @action:通过dispatch需要改变得值
  @CHANGE_INPUT: input框change事件，改变得value与inputVal绑定
  @ADD_ITEM: 点击提交按钮，将inputVal放入li中
  @DEL_ITEM: 点击哪个li删除哪个
*/
export default (state = defaultState, action) => {
  let newState = JSON.parse(JSON.stringify(state))

  switch (action.type) {
    case CHANGE_INPUT:
      newState.inputVal = action.value
      break;
    case ADD_ITEM:
      newState.list.push(newState.inputVal)
      break;
    case DEL_ITEM:
      newState.list.splice(action.value, 1)
      break;
    default:
      return state
      break;
  }
  return newState
}

　　

4. 新建src/store/actionType.js

export const CHANGE_INPUT = 'change_input'
export const ADD_ITEM = 'add_item'
export const DEL_ITEM = 'del_item'

　　

5. 新建src/store/actionCreated.js

import { CHANGE_INPUT, ADD_ITEM, DEL_ITEM } from './actionType'

export const changeInputAction = (value) => ({
  type: CHANGE_INPUT,
  value
})

export const addItemAction = (value) => ({
  type: ADD_ITEM,
  value
})

export const delItemAction = (value) => ({
  type: DEL_ITEM,
  value
})

　　

6.新建src/TodeList.js

/*
  @connect: 连接器-将state，dispatch连接在一起 connect(state, dispatch)(TodeList)
  @TodeList: 将TodeList封装成一个UI组件，并传入参数props，可以接受外部传的所有参数

*/
import React from 'react';
import { connect } from 'react-redux'
import { changeInputAction, addItemAction, delItemAction } from './store/actionCreated'

const TodeList = (props) => {
  let { inputVal, inputChange, clickButton, list, delItem } = props
  return (
    <div>
      <div>
        <input value={inputVal} onChange={inputChange} />
        <button onClick={clickButton}>提交</button>
      </div>
      <ul>
        {
          list.map((item, index) => {
            return <li key={item + index} onClick={delItem.bind(this, index)}>{item}</li>
          })
        }
      </ul>
    </div>
  );
}

const stateToProps = (state) => {
  return {
    inputVal: state.inputVal,
    list: state.list
  }
}

const dispatchToProps = (dispatch) => {
  return {
    inputChange(e) {
      let action = changeInputAction(e.target.value)
      dispatch(action)
    },
    clickButton() {
      let action = addItemAction()
      dispatch(action)
    },
    delItem(value) {
      let action = delItemAction(value)
      dispatch(action)
    }
  }
}

export default connect(stateToProps, dispatchToProps)(TodeList);