一.安裝插件

npm add lib-flexible postcss-px2rem

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 import 'lib-flexible'

    module.exports={
      css:{
    loaderOptions:{
      css:{},
      postcss:{
        plugins:[
          require('postcss-px2rem')({
            //適配375螢幕，設計圖750中量出來的尺寸要/2
            //配置成37.5是為了兼容沒有適配rem布局的第三方ui庫
            remUnit:37.5
          })
        ]
      }
    }
  }
}