在`create-react-app`中使用`webpack-stylesheet-variable-replacer-plugin`

在create-react-app中使用webpack-stylesheet-variable-replacer-plugin

第一步：引入react-app-rewired

create-react-app中无法直接修改webpack配置，所以需要引入react-app-rewired来实现覆盖webpack配置（也有其他方案，此处只演示使用react-app-rewired的方式）

1、下载包 ： npm install react-app-rewired --save-dev

2、 在根目录中创建文件： config-overrides.js;

3、 将以下文件贴入 config-overrides.js中

module.exports = function override(config, env) {
  //do stuff with the webpack config...
  return config;
}

4、 修改package.json文件：

  /* package.json */
  "scripts": {
-   "start": "react-scripts start",
+   "start": "react-app-rewired start",
-   "build": "react-scripts build",
+   "build": "react-app-rewired build",
-   "test": "react-scripts test",
+   "test": "react-app-rewired test",
    "eject": "react-scripts eject"
}

最终效果如下：

{
    "start": "react-app-rewired start",
    "build": "react-app-rewired build",
    "test": "react-app-rewired test",
    "eject": "react-scripts eject"
  }

第二步：配置webpack-stylesheet-variable-replacer-plugin

1、安装包 ：npm i webpack-stylesheet-variable-replacer-plugin -D

2、在 config-overrides.js中引入包：

const WebpackVariableReplacer = require('webpack-stylesheet-variable-replacer-plugin'); 

3、 在override方法中加入webpackVariableReplacer配置

module.exports = function override(config, env) {
  //do stuff with the webpack config...
  config.plugins.push(new WebpackVariableReplacer({
    htmlFileName: 'index.html', // if your application has a html file , It's used for inject javascript file.
    publicPath: config.output.publicPath, // as you need to inject javascript file , this is path prefix for visite the file for replace variable.
    matchVariables: { // It's a key-value Object , key is only alias for your variable , such as I use 'main' for main color I use in application.
      // notice that value is the original value in your style, not target you want to replace.
      main: '#282c34',
    }
  }));
  return config;
}

第三步 界面中加入换肤代码

 window.replaceStyleVariable({main: getRandomColor()})}>replace random color

function getRandomColor() {
  const rgb = []
  for (let i = 0; i < 3; ++i) {
    let color = Math.floor(Math.random() * 256).toString(16)
    color = color.length === 1 ? '0' + color : color
    rgb.push(color)
  }
  return '#' + rgb.join('')
}

第四步 开始愉快的玩耍吧，没有更多了。

demo链接：https://github.com/eaTong/webpack-stylesheet-variable-replacer-plugin/tree/master/demo/create-react-app-demo