React实战篇（React仿今日头条）

前言

上次初学用 react 写了个后台管理，这次便寻思写个移动端的项目。便有了这次的这个项目。

这个项目以前写了个 vue 的版本。有兴趣的可以 点击进入

模拟数据用的是 Easy Mock
用的是我以前写 vue-toutiao 用到的数据

账号: vue-toutiao
密码： 123456

技术栈

react + react-redux + react-router + webpack

结构：

• build: webpack配置
• config: 项目配置参数
• src
  actions: 存放 action 方法
  assets: 静态资源文件，存放图片啥的
  components: 常用组件
  reducers: 存放 reducer
  router: 路由管理
  store: 状态管理 redux
  styles: 样式文件
  utils: 常用封装
  views: 视图页面
• static: 静态文件： 存放 favicon.ico 等等

效果演示

知识点

按需加载

通过 import() 方法加载组件， 在通过高阶组件处理 import 返回的 Promise 结果。

// asyncComponent.js
import React from 'react'

export default loadComponent => (
    class AsyncComponent extends React.Component {
        state = {
            Component: null,
        }
        async componentDidMount() {
            if (this.state.Component !== null) return
            try {
                const {default: Component} = await loadComponent()
                this.setState({ Component })
            }catch (err) {
                console.error(`Cannot load component in <AsyncComponent />`);
                throw err
            }
        }

        render() {
            const { Component } = this.state
            return (Component) ? <Component {...this.props} /> : null
        }
    }
)

如下使用

import asyncComponent from './asyncComponent'
const Demo = asyncComponent(() => import(`views/demo.js`))
<Route path="/demo" component={Demo}/>

路由设置

统一配置路由，及路由状态

import asyncComponent from './asyncComponent'
const _import_views = file => asyncComponent(() => import(`views/${file}`))
export const loyoutRouterMap = [
    { 
        path: '/', 
        name: '首页', 
        exact: true,
        component: _import_views('Home')
    },
    { 
        path: '/video', 
        name: '视频',
        component: _import_views('Video')
    },
    { 
        path: '/headline', 
        name: '微头条',
        component: _import_views('Headline')
    },
    { 
        path: '/system', 
        name: '系统设置',
        auth: true, 
        component: _import_views('System')
    }
] 

登录拦截

通过路由配置中 auth 属性来判断是否需要登录
如以下配置

{ 
    path: '/system', 
    name: '系统设置',
    auth: true, 
    component: _import_views('System')
}

登陆配置及判断

// authRoute.js
import React from 'react'
import store from '../store'
import { Route, Redirect } from 'react-router-dom'

export default class extends React.Component {
    render () {
        let {component: Component, ...rest} = this.props
        // 是否登录
        if (!store.getState().user.user.name) {
            return <Redirect to='/login' />
        }
        return <Route {...rest}  component={Component}/>
    }
}


// 生成route
const renderRouteComponent = routes => routes.map( (route, index) => {
    if (route.auth) { // 需要权限登录
        return <AuthRoute key={index} {...route}/>
    }
    return <Route key={index} {...route}/>
})

路由动画

通过 react-router-transition 做的切换动画。

然后通过 history.slideStatus 来判断如何动画

react-router-transition 具体API

redux-thunk处理action异步

用 redux-actions 来书写 action 跟 reducer

// action.js
import { createAction } from 'redux-actions'
import axios from 'utils/axios'
export const getHeadlineList = (params) => dispatch => {
    return new Promise( (resolve, reject) => {
        axios.get('headline/list', params)
            .then( res => {
                const list = res.data.list
                dispatch(createAction('GET_HEADLINE_LIST')(list))
                resolve(list)
            }).catch( err => {
                reject(err)
            })
    })
}

// reducer.js
import { handleActions } from 'redux-actions'
import { combineReducers } from 'redux'
const state = {
    headlineList: []
}
const headline = handleActions({
    GET_HEADLINE_LIST: (state, action) => {
        let list = action.payload
        state.headlineList = state.headlineList.concat(list)
        return {...state}
    }
}, state)
export default combineReducers({
    headline
})

// store.js  
// redux-thunk配置
import { createStore, compose, applyMiddleware  } from 'redux'
import reducer from '../reducers'
import thunk from 'redux-thunk'
const configureStore => createStore(
    reducer,
    compose(
        applyMiddleware(thunk)
    ) 
)
export default configureStore()

还有一些零零散散的知识点，就不介绍了，具体可以到 github 上查看。

github
个人博客
在线观看地址