h5/postcss.config.js

const path = require('path')
module.exports = {
  parser: require('postcss-comment'),
  plugins: [
    require('postcss-import')({
      resolve(id, basedir, importOptions) {
        if (id.startsWith('~@/'))
          return path.resolve(process.env.UNI_INPUT_DIR, id.substr(3))
        else if (id.startsWith('@/'))
          return path.resolve(process.env.UNI_INPUT_DIR, id.substr(2))
        else if (id.startsWith('/') && !id.startsWith('//'))
          return path.resolve(process.env.UNI_INPUT_DIR, id.substr(1))

        return id
      }
    }),
    require('autoprefixer')({
      remove: process.env.UNI_PLATFORM !== 'h5'
    }),
    require('@dcloudio/vue-cli-plugin-uni/packages/postcss')
  ]
}