Redux开发实用教程

import { createStore } from 'redux';

// 创建Redux reducer
/**
 * 这是一个 reducer，形式为 (state, action) => state 的纯函数。
 * 描述了 action 如何把 state 转变成下一个 state。
 *
 * state 的形式取决于你，可以是基本类型、数组、对象,
 * 当 state 变化时需要返回全新的对象，而不是修改传入的参数。
 *
 * 下面例子使用 `switch` 语句和字符串来做判断，但你可以写帮助类(helper)
 * 根据不同的约定（如方法映射）来判断，只要适用你的项目即可。
 */
function counter(state = 0, action) {
  switch (action.type) {
  case 'INCREMENT':
    return state + 1;
  case 'DECREMENT': 
    return state - 1;
  default:
    return state;
  }
}

// 创建 Redux store 来存放应用的状态。
// API 是 { subscribe, dispatch, getState }。
let store = createStore(counter);

// 可以手动订阅更新，也可以事件绑定到视图层。
store.subscribe(() =>
  console.log(store.getState())
);

// 改变内部 state 惟一方法是 dispatch 一个 action。
// action 可以被序列化，用日记记录和储存下来，后期还可以以回放的方式执行
store.dispatch({ type: 'INCREMENT' });
// 1
store.dispatch({ type: 'INCREMENT' });
// 2
store.dispatch({ type: 'DECREMENT' });
// 1

import { ADD_TODO, REMOVE_TODO } from '../actionTypes'

//action
{
  type: ADD_TODO,
  text: 'Build my first Redux app'
} 

function addTodo(text) {
  return {
    type: ADD_TODO,
    text
  }
}

(previousState, action) => newState

//reducer
function todoApp(state = initialState, action) {
  switch (action.type) {
    case SET_VISIBILITY_FILTER:
      return Object.assign({}, state, {
        visibilityFilter: action.filter
      })
    default:
      return state
  }
}

function onAction(state = defaultState, action) {
    switch (action.type) {
        case Types.THEME_CHANGE://主题
            return {
                ...state,
                theme: action.theme,
            };
        case Types.SHOW_THEME_VIEW://主题
            return {
                ...state,
                customThemeViewVisible: action.customThemeViewVisible,
            };
        case Types.SORT_LANGUAGE://排序
            return Object.assign({}, state, {
                checkedArray: action.checkedArray,
            });
        case Types.REFRESH_ABOUT://关于
            return Object.assign({}, state, {
                [action.flag]: {
                    ...state[action.flag],
                    projectModels: action.projectModels,
                }
            });
        case Types.ABOUT_SHOW_MORE://关于
            return Object.assign({}, state, {
                me: {
                    ...state.me,
                    [action.menuFlag]: action.menuShow
                }
            });
        default:
            return state;
    }
}

//主题 theme.js
export default function onTheme(state = defaultState, action) {
    switch (action.type) {
        case Types.THEME_CHANGE:
            return {
                ...state,
                theme: action.theme,
            };
        case Types.SHOW_THEME_VIEW:
            return {
                ...state,
                customThemeViewVisible: action.customThemeViewVisible,
            };
        default:
            return state;
    }
}

//排序 sort.js
export default function onSort(state = defaultState, action) {
    switch (action.type) {
        case Types.SORT_LANGUAGE:
            return Object.assign({}, state, {
                checkedArray: action.checkedArray,
            });
        default:
            return state;
    }
}

//关于 about.js
export default function onAbout(state = defaultState, action) {
    switch (action.type) {
        case Types.REFRESH_ABOUT:
            return Object.assign({}, state, {
                [action.flag]: {
                    ...state[action.flag],
                    projectModels: action.projectModels,
                }
            });
        case Types.ABOUT_SHOW_MORE:
            return Object.assign({}, state, {
                me: {
                    ...state.me,
                    [action.menuFlag]: action.menuShow
                }
            });
        default:
            return state;
    }
}

import {combineReducers} from 'redux'
import theme from './theme'
import sort from './sort'
import about from './about'

const index = combineReducers({
    theme: theme,
    sort: sort,
    about: about,
})
export default index;

import { createStore } from 'redux'
import todoApp from './reducers'
let store = createStore(todoApp)

npm install --save redux-thunk

import thunk from 'redux-thunk'
let middlewares = [
    thunk
]
//添加异步中间件redux-thunk
let createAppStore = applyMiddleware(...middlewares)(createStore)

export function onSearch(inputKey, token, popularKeys) {
    return dispatch => {
        dispatch({type: Types.SEARCH_REFRESH});
        fetch(genFetchUrl(inputKey)).then(response => {//如果任务取消，则不做任何处理
            return checkCancel(token) ? response.json() : null;
        }).then(responseData => {
            if (!checkCancel(token, true)) {//如果任务取消，则不做任何处理
                return
            }
            if (!responseData || !responseData.items || responseData.items.length === 0) {
                dispatch({type: Types.SEARCH_FAIL, message: inputKey + '什么都没找到'});
                return
            }
            let items = responseData.items;
            getFavoriteKeys(inputKey, dispatch, items, token, popularKeys);
        }).catch(e => {
            console.log(e);
            dispatch({type: Types.SEARCH_FAIL, error: e});
        })
    }
}