postcss-px2rem配置

首先需要安装postcss-plugin-px2rem

npm install --save-dev postcss-plugin-px2rem
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可以在package.json中配置

var px2rem = require('postcss-px2rem');

module.exports = {
  module: {
    loaders: [
      {
        test: /\.css$/,
        loader: "style-loader!css-loader!postcss-loader"
      }
    ]
  },
  postcss: function() {
    return [px2rem({remUnit: 75})];
  }
}
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一般postcss建议单独配置在文件postcss.config.js中，

module.exports = {
  plugins: [
    require('autoprefixer')({ browsers: 'last 2 versions' }),
    require('postcss-px2rem')({remUnit: 75})
  ]
}
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REM是根据根结点来计算各个子节点的值，所以根结点也要做响应式变化。定义一个utils/setRem.js

export default function setRem(baseWidth = 750) {
  const dpr = window.devicePixelRatio;
  const currentWidth = document.documentElement.clientWidth;
  let remSize = 0;
  let scale = 0;
  scale = currentWidth / baseWidth;
  remSize = baseWidth / 10;
  remSize = remSize * scale;
  document.documentElement.style.fontSize = remSize + 'px';
  document.documentElement.setAttribute('data-dpr', `${dpr}`);
}
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在index.js中引入即可

import setRem from './utils/setRem'
setRem()
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