React多页面应用2(处理CSS及图片,引入postCSS,及图片处理等)

时间:2022-05-08
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1.React多页面应用1(webpack开发环境搭建,包括Babel、热更新等) ----2017.12.28

2.React多页面应用2(处理CSS及图片,引入postCSS及图片处理等)----2017.12.29

3.React多页面应用3(webpack性能提升,包括打包性能、提取公共包等)----2017.12.30

4.React多页面应用4(webpack自动化生成多入口页面)----2017.12.31

5.React多页面应用5(webpack生产环境配置,包括压缩js代码,图片转码等)----2018.01.01

6.React多页面应用6(gulp自动化发布到多个环境,生成版本号,打包成zip等)----2018.01.02

7.React多页面应用7(引入eslint代码检查)----2018.01.03

开发环境:Windows 8,node v8.9.1,npm 5.5.1,WebStorm 2017.2.2

1.添加postCSS 支持 

npm i -D precss postcss-loader postcss-cssnext style-loader css-loader

2.配置postcss

根目录下 postcss.config.js

module.exports = {
    plugins: [
        require('precss'),
      require('postcss-cssnext')
    ]
}

3.配置 webpack 开发配置

config -> webpack -> webpack.dev.conf.js

const webpack = require('webpack');//引入webpack
const opn = require('opn');//打开浏览器
const merge = require('webpack-merge');//webpack配置文件合并
const path = require("path");
const baseWebpackConfig = require("./webpack.base.conf");//基础配置
const webpackFile = require("./webpack.file.conf");//一些路径配置

let config = merge(baseWebpackConfig, {
    output: {
        path: path.resolve(webpackFile.devDirectory),
        filename: 'js/[name].js',
        chunkFilename: "js/[name]-[id].js",
        publicPath: ''
    },
    plugins: [
        /*设置开发环境*/
        new webpack.DefinePlugin({
            'process.env': {
                NODE_ENV: JSON.stringify('development'),
            }
        }),
        /*设置热更新*/
        new webpack.HotModuleReplacementPlugin(),
    ],
    module: {
        rules: [
            {
                test: /.(js|jsx)$/,
                use: [
                    'babel-loader',
                ],
                include: [
                    path.resolve(__dirname, "../../app"),
                    path.resolve(__dirname, "../../entryBuild")
                ],
                exclude: [
                    path.resolve(__dirname, "../../node_modules")
                ],
            },
            {
                test: /.(css|pcss)$/,
                loader: 'style-loader?sourceMap!css-loader?sourceMap!postcss-loader?sourceMap',
                exclude: /node_modules/
            }
        ]
    },
    /*设置api转发*/
    devServer: {
        host: '0.0.0.0',
        port: 8080,
        hot: true,
        inline: true,
        contentBase: path.resolve(webpackFile.devDirectory),
        historyApiFallback: true,
        disableHostCheck: true,
        proxy: [
            {
                context: ['/api/**', '/u/**'],
                target: 'http://192.168.12.100:8080/',
                secure: false
            }
        ],
        /*打开浏览器 并打开本项目网址*/
        after() {
            opn('http://localhost:' + this.port);
        }
    }
});
module.exports = config;

新加了如下配置代码

{
    test: /.(css|pcss)$/,
    loader: 'style-loader?sourceMap!css-loader?sourceMap!postcss-loader?sourceMap',
    exclude: /node_modules/
}

4.新建index.pcss 文件

app -> public -> css 目录下

.cont {
  .top {
    color: #FF9302;
  }
  .bottom {
    color: #F00000;
  }
}

如果编译器 报错: 请安装postCSS插件

5.react组件 引入index.pcss 文件

import React from 'react';
import '../../public/css/index.pcss'

class Index extends React.Component {
    constructor(props) {
        super(props);
        this.state = { seconds: 0 };
    }

    tick() {
        this.setState(prevState => ({
            seconds: prevState.seconds + 1
        }));
    }

    componentDidMount() {
        this.interval = setInterval(() => this.tick(), 1000);
    }

    componentWillUnmount() {
        clearInterval(this.interval);
    }

    render() {
        return (
            <div className="cont">
                <div className="top">
                    这是首页222222
                </div>
                <div className="bottom">
                    Seconds: {this.state.seconds}
                </div>
            </div>
        );
    }
}

export default Index;

现在你的工程就支持postCSS了.

6.图片的处理

原则上本地图片建议都放在背景里

添加依赖

npm i -D file-loader

7.修改webpack配置文件

config -> webpack -> webpack.dev.conf.js

const webpack = require('webpack');//引入webpack
const opn = require('opn');//打开浏览器
const merge = require('webpack-merge');//webpack配置文件合并
const path = require("path");
const baseWebpackConfig = require("./webpack.base.conf");//基础配置
const webpackFile = require("./webpack.file.conf");//一些路径配置

let config = merge(baseWebpackConfig, {
    output: {
        path: path.resolve(webpackFile.devDirectory),
        filename: 'js/[name].js',
        chunkFilename: "js/[name]-[id].js",
        publicPath: ''
    },
    plugins: [
        /*设置开发环境*/
        new webpack.DefinePlugin({
            'process.env': {
                NODE_ENV: JSON.stringify('development'),
            }
        }),
        /*设置热更新*/
        new webpack.HotModuleReplacementPlugin(),
    ],
    module: {
        rules: [
            {
                test: /.(js|jsx)$/,
                use: [
                    'babel-loader',
                ],
                include: [
                    path.resolve(__dirname, "../../app"),
                    path.resolve(__dirname, "../../entryBuild")
                ],
                exclude: [
                    path.resolve(__dirname, "../../node_modules")
                ],
            },
            {
                test: /.(css|pcss)$/,
                loader: 'style-loader?sourceMap!css-loader?sourceMap!postcss-loader?sourceMap',
                exclude: /node_modules/
            },
            {
                test: /.(png|jpg|gif|ttf|eot|woff|woff2|svg|swf)$/,
                loader: 'file-loader?name=[name].[ext]&outputPath=' + webpackFile.resource + '/'
            }
        ]
    },
    /*设置api转发*/
    devServer: {
        host: '0.0.0.0',
        port: 8080,
        hot: true,
        inline: true,
        contentBase: path.resolve(webpackFile.devDirectory),
        historyApiFallback: true,
        disableHostCheck: true,
        proxy: [
            {
                context: ['/api/**', '/u/**'],
                target: 'http://192.168.12.100:8080/',
                secure: false
            }
        ],
        /*打开浏览器 并打开本项目网址*/
        after() {
            opn('http://localhost:' + this.port);
        }
    }
});
module.exports = config;

新添加了 如下配置代码

{
    test: /.(png|jpg|gif|ttf|eot|woff|woff2|svg|swf)$/,
    loader: 'file-loader?name=[name].[ext]&outputPath=' + webpackFile.resource + '/'
}

8.插入图片

修改 index.pcss

app -> public -> css 目录下

.cont {
  .top {
    color: #FF9302;
    .bd_logo1 {
      display: inline-block;
      width: 540px;
      height: 258px;
      background-image: url("../img/bd_logo1.png");
      background-size: contain;
    }
  }
  .bottom {
    color: #F00000;
  }
}

9.再次运行

npm run dev

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