REACT-SAGA 入门项目搭建笔记

用于学习记录

项目地址：开源中国

Install

Core Lib

//webpack
npm install --save-dev webpack
npm install --save-dev webpack-dev-server

//react 
npm install --save react react-dom
//router v4版本
npm install --save react-router react-router-dom
//redux
npm install --save redux react-redux redux-saga

//babel
npm install --save-dev babel-core babel-loader babel-preset-react babel-preset-es2015 babel-preset-stage-0 babel-preset-stage-3

Plugins

Webpack-Browser-Plugin

用于自动打开浏览器

new WebpackBrowserPlugin()

Html-Webpack-Plugin

用于动态生成index入口页面

new HtmlWebpackPlugin({
    title: 'Development'
  })

Clean-Webpack-Plugin

清空webpack某个目录、一般用于构件项目之前清空项目输出目录，如：

new CleanWebpackPlugin(['dist']),

Loader

用于编译jsx、es6、react代码的loader

rules: [{
          test: /.jsx?$/,exclude: /node_modules/,use: [{
              loader: "babel-loader"
          }],}]

Init

初始化核心对象

Saga

集中管理action分发、调用

/**
- saga 集中管理action分发、异步操作
- action约定：
-       type:
-           异步：FETCH_${ACTION.TYPE}
-           同步：LOCAL_${ACTION.TYPE}
-           
-       asyn:true|false     
-       data:Object
- 
 */

import {fork,put,take,call} from 'redux-saga/effects'
import util from './util'

/**
- 加载数据方法
- 在这里、我们可以集中调用真实的API接口
- 我们可以把action type 和 api url 做个映射
- 这样的话、我们可以减少重复的调用接口方法
- @Author   WangBing
- @DateTime 2017-11-07
- @returns  {[type]}   [description]
 */
function load(data){
    return new Promise((resolve,reject)=>{
        setTimeout(()=>{
            resolve(data);
        },100)
    })
}

/**
- 用于开发调试的工具函数
- @Author   WangBing
- @DateTime 2017-11-07
- @param    {[type]}   action [description]
- @returns  {[type]}          [description]
 */
function logger(action){
    console.log(`dispatche action`);
    console.dir(action)
}


/**
- 异步加载数据
- @Author   WangBing
- @DateTime 2017-11-07
- @param    {[type]}   action        [description]
- @yields   {[type]}   [description]
 */
function* asynLoader(action){
    try{
        var result=yield call(load,action.data);
        yield put({
            type:util.success(action.type),data:result
        })
        return result;
    }catch(e){
        console.error('run action:'+action.type);
        console.error("action load error with a exception")
        console.error(e)
    }
}


/**
- 定义一个Watcher监控所有类型的action
- @Author   WangBing
- @DateTime 2017-11-07
- @yields   {[type]}   [description]
 */
function* watcher(){
    while(true){
        const action=yield take("*");
        logger(action);
        if(action.sync){
            yield put(action);
        }else{
            yield call(asynLoader,action);
        }
    }
}

export default function* rootSaga(){
    yield fork(watcher);
}

Store

初始化store

import {createStore,applyMiddleware} from "redux";
import createSagaMiddleware from 'redux-saga';

import RootReducer from './reducer';

var sagaMiddleware=createSagaMiddleware();

var store=createStore(RootReducer,applyMiddleware(sagaMiddleware));

export default {
    ...store,run:sagaMiddleware.run
}

Reducer

分模块初始化reducer

import { combineReducers } from 'redux'

import AppReducer from 'src/router/reducer';
import HomeReducer from 'src/router/home/reducer';

export const RootReducer=combineReducers({
    app:AppReducer,home:HomeReducer
})

export default RootReducer

Build Performance

Devtool

不同的devtool模式、有不用的效果、需要合理设置

开发环境推荐：

cheap-module-eval-source-map

生产环境推荐：

cheap-module-source-map

（编辑：李大同）

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