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React 16.x折腾记 - (5) 记录用React开发项目过程遇到的问题(Webpack4/React16/antd等)

前言

自己搭的脚手架,坑都是一步一步踩完的;

技术栈: react@16.6.0/ react-router-dom@v4 / webpack^4.23.1(babel7+)

闲话不多说,直入主题,有兴趣的可以瞧瞧,没兴趣的止步,节约您的时间.

问题列表

问题一:history模式下,接口和请求冲突的问题

就是反向映射接口和请求的根路径重叠,如下:


        proxy: {
            '/': {
                target: 'http://192.168.31.100/api/web',
                changeOrigin: true,
                secure: false,
            }
        },

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这样映射会造成路由寻址不到,这个问题我遇到的时候,浪费了挺多时间,最后发现还是有解的;

网上大多数人的写法就是,加个prefix(聚合一个前缀),然后用pathRewrite重写请求路径

        proxy: {
            '/api': {
                target: 'http://192.168.31.100/api/web',
                changeOrigin: true,
                secure: false,
                pathRewrite: { '^/api': '/' },
            }
        },
        historyApiFallback: true 

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可这法子,不大适合我这边...能不能重叠又不影响,

翻了一些Stack Overflow上的问答和文档,发现还是有的.

下面的写法就是先判断是html请求还是其他请求,若是请求html则不反向代理

        proxy: {
            '/': {
                target: 'http://192.168.31.100/api/web',
                changeOrigin: true,
                secure: false,
                // pathRewrite: { '^/api': '/' },
                bypass: function(req, res, proxyOptions) {
                    if (req.headers.accept.indexOf('html') !== -1) {
                        console.log('Skipping proxy for browser request.');
                        return '/index.html';
                    }
                }
            }
        },
        historyApiFallback: true 

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问题二: 如何非ts下支持装饰器 , 以及常规的语法解析

因为用了mobx,实在不想用高阶函数的写法(一堆括号)。

我是直接配置babelrc的. 跟随最新babel 7,装上这个依赖即可支持

  • @babel/plugin-proposal-decorators -- 装饰器支持
  • @babel/plugin-syntax-dynamic-import -- 动态引入相关代码,适用于代码分离
  • babel/plugin-proposal-object-rest-spread -- ...的支持
  • @babel/plugin-proposal-class-properties -- class支持
  • babel-plugin-import -- 阿里出品的css 按需加载
  • react-hot-loader/babel -- 配置react-hot-loader会用到
{
  "presets": [
    [
      "@babel/preset-env",
      {
        "targets": {
          "browsers": [
            "last 3 versions",
            "safari >= 7"
          ]
        },
        "modules": false,
        "debug": false,
        "useBuiltIns": "usage"
      }
    ],
    "@babel/preset-react"
  ],
  "plugins": [
    [
      "@babel/plugin-proposal-decorators",
      {
        "legacy": true
      }
    ],
    [
      "@babel/plugin-proposal-class-properties",
      {
        "loose": true
      }
    ],
    "@babel/plugin-proposal-object-rest-spread",
    [
      "import",
      {
        "libraryName": "antd",
        "libraryDirectory": "es",
        "style": "css"
      }
    ],
    "@babel/plugin-syntax-dynamic-import",
    "react-hot-loader/babel"
  ]
}

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问题三: mobx实现路由基础鉴权

  • model
import { observable, action, computed, toJS } from 'mobx';
import API from 'services';  // axios的封装

class AuthModel {
    constructor() {}

    // 登录请求
    @action
    requestLogin = async values => {
        // 登录接口
        const data = await API.post('/admin/login', values);
        const AuthUserData = JSON.stringify(data);
        window.localStorage.setItem('AuthUserData', AuthUserData);
        window.location.href = '/';
    };

    // 退出登录
    @action
    requestLogout = async values => {
        this.UserData = {}; // 重置为空对象
        this.isPermission = false;
        window.localStorage.removeItem('AuthUserData');
        window.location.href = '/entrance/login';
    };

    @computed
    get isAuthenticated() {
        if (window.localStorage.getItem('AuthUserData')) {
            if (JSON.parse(window.localStorage.getItem('AuthUserData')).token) {
                return true;
            }
            return false;
        } else {
            return false;
        }
    }
}

const Auth = new AuthModel();

export default Auth;


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  • 在对应的入口引入,结合react-route-domswitch跳转

import React, { Component } from 'react';
import { hot } from 'react-hot-loader';
import DevTools from 'mobx-react-devtools';
import { BrowserRouter, Route, Switch, Redirect } from 'react-router-dom';
import { observer, inject } from 'mobx-react';
import './App.css';
import ErrorBoundary from 'components/ErrorBoundary/ErrorBoundary';
import asyncComponent from 'components/asyncComponent/asyncComponent';

// 登录注册找回密码
const Entrance = asyncComponent(() => import('pages/Entrance/Entrance'));

// 管理后台
import AdminLayout from 'pages/Layout/AdminLayout';

@inject('auth')
@observer
export class App extends Component {
    constructor(props) {
        super(props);
    }
    componentDidMount = () => {};

    render() {
        const { isAuthenticated } = this.props.auth;
        return (
            <ErrorBoundary>
                <BrowserRouter>
                    <div>
                        <Switch>
                            <Route
                                path="/entrance"
                                render={() =>
                                    isAuthenticated ? (
                                        <Redirect exact to="/" />
                                    ) : (
                                        <Entrance />
                                    )
                                }
                            />
                            <Route
                                path="/"
                                render={() =>
                                    isAuthenticated ? (
                                        <AdminLayout />
                                    ) : (
                                        <Redirect exact to="/entrance" />
                                    )
                                }
                            />
                        </Switch>
                        {/**这里是开启了开发模式下显示mobx的devtool*/}
                        {process.env.NODE_ENV === 'development' ? (
                            <DevTools />
                        ) : null}
                    </div>
                </BrowserRouter>
            </ErrorBoundary>
        );
    }
}

// react-hot-loader v4的写法
export default hot(module)(App);


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问题四: 加快开发模式下的编译,以及常规的美化输出

用了happypack来加快了js,css的编译速度(多进程),给css也开启了tree shaking

我这个项目没有引入lesssass,用styled-components@4来写样式

  • webpack.base.config.js

const webpack = require('webpack');
const path = require('path');

// 终端输出进度条
const WebpackBar = require('webpackbar');

// html模板
const HtmlWebpackPlugin = require('html-webpack-plugin');

// css 抽离
const MiniCssExtractPlugin = require('mini-css-extract-plugin');

// 多进程编译
const HappyPack = require('happypack');
const os = require('os');
const happyThreadPool = HappyPack.ThreadPool({ size: os.cpus().length });

// 给脚本预添加信息
const ScriptExtHtmlWebpackPlugin = require('script-ext-html-webpack-plugin');

// css tree shaking

const glob = require('glob');
const PurifyCSSPlugin = require('purifycss-webpack');

// 显示编译时间
const ProgressBarPlugin = require('progress-bar-webpack-plugin');
const chalk = require('chalk');

const config = {
    entry: [path.resolve(__dirname, '../src')],
    resolve: {
        extensions: ['.js', '.jsx'],
        modules: [path.resolve(__dirname, '../src'), 'node_modules'],
        alias: {
            store: path.resolve(__dirname, '..', 'src/store'),
            transition: path.resolve(__dirname, '..', 'src/transition'),
            components: path.resolve(__dirname, '..', 'src/components'),
            utils: path.resolve(__dirname, '..', 'src/utils'),
            pages: path.resolve(__dirname, '..', 'src/pages'),
            views: path.resolve(__dirname, '..', 'src/views'),
            services: path.resolve(__dirname, '..', 'src/services'),
            assets: path.resolve(__dirname, '..', 'src/assets'),
            router: path.resolve(__dirname, '..', 'src/router')
        }
    },
    performance: {
        hints: false
    },
    plugins: [
        // 显示打包时间
        new ProgressBarPlugin({
            format:
                '  build [:bar] ' +
                chalk.green.bold(':percent') +
                ' (:elapsed seconds)'
        }),
        // css tree shaking
        new PurifyCSSPlugin({
            // 路劲扫描 nodejs内置 路劲检查
            paths: glob.sync(path.join(__dirname, 'pages/*/*.html'))
        }),
        // 进度条
        new WebpackBar(),
        // 定制全局变量
        new webpack.DefinePlugin({
            'process.env.NODE_ENV': JSON.stringify(process.env.NODE_ENV)
        }),
        // 生成引用一个或多个出口文件的html,需要生成多少个 html 就 new 多少此该插件
        new HtmlWebpackPlugin({
            // 没有引入模板时的默认title,favicon也一样,但filename除外
            title: 'index',
            favicon: path.resolve(__dirname, '../public/favicon.png'),
            // 定义插入到文档哪个节点,默认在body倒数位置
            inject: 'body',
            filename: 'index.html',
            template: path.resolve(__dirname, '../public/index.html'),
            // 压缩html文件
            // 详细的配置 https://github.com/kangax/html-minifier#options-quick-reference
            minify:
                process.env.NODE_ENV === 'production'
                    ? {
                          removeComments: true,
                          collapseWhitespace: true,
                          removeRedundantAttributes: true,
                          useShortDoctype: true,
                          removeEmptyAttributes: true,
                          removeStyleLinkTypeAttributes: true,
                          keepClosingSlash: true,
                          minifyJS: true,
                          minifyCSS: true,
                          minifyURLs: true
                      }
                    : {},
            // 在js文件后面加上一段hash码,默认为false
            hash: true
        }),
        new HappyPack({
            id: 'js',
            threadPool: happyThreadPool,
            loaders: ['babel-loader?cacheDirectory=true']
        }),
        new HappyPack({
            id: 'css',
            threadPool: happyThreadPool,
            loaders: [
                {
                    loader: 'css-loader',
                    options: {
                        importLoaders: 1 // 0 => 无 loader(默认); 1 => postcss-loader; 2 => postcss-loader, sass-loader
                    }
                },
                'postcss-loader'
            ]
        }),
        new MiniCssExtractPlugin({
            // Options similar to the same options in webpackOptions.output
            // both options are optional
            filename:
                process.env.NODE_ENV !== 'production'
                    ? 'static/css/[name].css'
                    : 'static/css/[name].[hash].css',
            chunkFilename:
                process.env.NODE_ENV !== 'production'
                    ? 'static/css/[id].css'
                    : 'static/css/[id].[hash].css'
        })
    ],
    module: {
        rules: [
            {
                test: /\.js$/,
                include: [path.resolve(__dirname, '../src')],
                exclude: /node_modules/,
                use: 'happypack/loader?id=js'
            },
            {
                test: /\.css$/,
                loaders: [
                    'style-loader',
                    // {
                    //     loader: 'css-loader',
                    //     options: {
                    //         importLoaders: 1 // 0 => 无 loader(默认); 1 => postcss-loader; 2 => postcss-loader, sass-loader
                    //     }
                    // },
                    // 'postcss-loader'
                    'happypack/loader?id=css'
                ]
            },
            {
                test: /\.json$/,
                loader: 'file-loader',
                options: {
                    name: 'json/[name].[ext]',
                    outputPath: 'static'
                }
            },
            {
                test: /\.(jpe?g|png|gif)(\?.*)?$/,
                include: [path.resolve(__dirname, '../src/assets/')],
                exclude: /node_modules/,
                use: [
                    {
                        loader: 'file-loader',
                        options: {
                            name: '/images/[name].[ext]?[hash]',
                            outputPath: 'static'
                        }
                    }
                ]
            },
            {
                test: /\.(eot|svg|ttf|woff|woff2)$/,
                use: [
                    {
                        loader: 'file-loader',
                        options: {
                            name: 'fonts/[name].[ext]',
                            outputPath: 'static'
                        }
                    }
                ]
            }
        ]
    }
};

module.exports = config;
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  • 效果图如下

问题五: 用新的getDerivedStateFromProps取代componentWillReceiveProps?

新的写法是组合写法,若是只用这个静态方法有时候会造成无限循环渲染,导致堆栈溢出

一旦用了static getDerivedStateFromProps(nextProps, prevState) ,必须返回一个值,

若是不更新state,那就返回null;

有时候在这里返回新的state不够严谨,这时候就要结合componentDidUpdate来变得更可控

componentDidUpdate = (prevProps, prevState, snapshot) 这个生命周期的第三个参数

是用来捕获更新前的state(其实就是getDerivedStateFromProps返回的)

问题六: antd上传组件结合axios上传失败

这个问题挺坑的,antd官方文档说了可以设置header, headerform-data就挂了(默认就是这个提交格式)

最终axios里面还要过滤下,在请求拦截器里面

// 产生一个基于 axios 的新实例
const api = axios.create({
    baseURL: process.env.NODE_ENV === 'development' ? isDev : isProd, // 接口根路径
    timeout: 5000, // 超时时间
    withCredentials: true, // 是否跨站点访问控制请求,携带 cookie
    responseType: 'json', // 响应数据格式
    headers: {
        // 设置请求头cd
        'Content-Type': 'application/x-www-form-urlencoded;charset=utf-8'
    }
});

// http请求拦截器
api.interceptors.request.use(
    config => {
        // 请求开始,蓝色过渡滚动条开始出现
        NProgress.start();
        if (window.localStorage.getItem('AuthUserData')) {
            let token =
                '不给你看 ' +
                JSON.parse(window.localStorage.getItem('AuthUserData')).token;
            config.headers.Authorization = token;
        }

        if (
            config.method === 'post' ||
            config.method === 'put' ||
            config.method === 'patch'
        ) {
            //  这段就是问答的解决所在,识别为该格式的数据,不用`qs`编码,直接提交
            if (config.headers['Content-Type'] === 'multipart/form-data') {
                return config;
            }

            // 若是需要对接口的字段进行序列化则可以使用一个迷你库
            // 在最顶部引入`qs`,序列化提交的数据
            config.data = qs.stringify(config.data);
        }
        return config;
    },
    error => {
        message.error(error);
        Promise.reject(error);
    }
);

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问题七: Antd及moment默认全局中文注入


import React, {
    StrictMode,
    unstable_ConcurrentMode as ConcurrentMode
} from 'react';
import ReactDOM from 'react-dom';
import App from 'App';

// mobx 注入
import { Provider } from 'mobx-react'; // react mobx的耦合器
import RootStore from 'store/store';

// 全局中文
import { LocaleProvider } from 'antd';
import zh_CN from 'antd/lib/locale-provider/zh_CN';
import 'moment/locale/zh-cn';


ReactDOM.render(
    <Provider {...RootStore}>
        <LocaleProvider locale={zh_CN}>
            <App />
        </LocaleProvider>
    </Provider>,
    document.getElementById('root')
);

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总结

写完了整个后台管理系统,发现mobx并没有想象中的好用;

看到阿里的umi已经2.x了(应该挺稳定了),准备用这个umi+dva重写整个项目。

不对之处,请留言,会及时修正,谢谢阅读

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