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适配移动端配置px2rem（自动将px转rem）
vue配置px2rem
1、安装

npm install px2rem-loader lib-flexible –save
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2、在项目入口文件main.js中引入lib-flexible

import ‘lib-flexible/flexible.js’
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3、在build下的 utils.js中，generateLoaders 方法。

const px2remLoader = {
loader: ‘px2rem-loader’,
options: {
remUnit: 75 // 设计图的1/10
}
}
function generateLoaders (loader, loaderOptions, anotherLoader) {
const loaders = options.usePostCSS ? [cssLoader, postcssLoader,px2remLoader] : [cssLoader,px2remLoader]

if (loader) {
loaders.push({
loader: loader + ‘-loader’,
options: Object.assign({}, loaderOptions, {
sourceMap: options.sourceMap
})
})
}
if (!!anotherLoader) loaders.push(anotherLoader)

// Extract CSS when that option is specified
// (which is the case during production build)
if (options.extract) {
return ExtractTextPlugin.extract({
use: loaders,
fallback: ‘vue-style-loader’
})
} else {
return [‘vue-style-loader’].concat(loaders)
}
}
小程序配置px2rem
H5转rem,小程序是rpx,统一配置：npm install px2rpx-loader

const px2remLoader = {
loader: ‘px2rem-loader’,
options: {
remUnit: 75 // 设计图的1/10
}
}
const px2rpxLoader = {
loader: ‘px2rpx-loader’,
options: {
baseDpr: 1,
rpxUnit: 1
}
}

react配置px2rem（react-create-app的基础上）
首先，下载

npm i lib-flexible postcss-px2rem-exclude –s

然后，webpack.config.js

const px2rem = require(‘postcss-px2rem-exclude’);

找到postcss-loader

{

loader: require.resolve(‘postcss-loader’),
options: {

ident: 'postcss',
plugins: () => [
  require('postcss-flexbugs-fixes'),
  require('postcss-preset-env')({
    autoprefixer: {
      flexbox: 'no-2009',
    },
    stage: 3,
  }),
    //px2rem 修改地方
    px2rem({remUnit:75,exclude:/node_modules/i})
],
sourceMap: isEnvProduction && shouldUseSourceMap,

},
},
最后在index.js

//px2rem
import ‘lib-flexible/flexible’