• 下載lib-flexible

npm i lib-flexible --save

• 在main.js中引入lib-flexible

import 'lib-flexible/flexible'

• 檢視index.js有沒有新增meta標籤

<meta name="viewport" content="width=device-width,initial-scale=1.0">
//注意這兩個的區別，建議新增下面的meta，反正點選輸入框，頁面自動縮放
<meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0"
 
>

• 安裝px2rem-loader

npm install px2rem-loader

• 在build檔案中找到util.js，將px2rem-loader新增到cssLoaders中

const cssLoader = {
    loader: 'css-loader',
    options: {
      minimize: process.env.NODE_ENV === 'production',
      sourceMap: options.sourceMap
    }
  }
  const px2remLoader = {
    loader: 'px2rem-loader'
 
,
    options: {
      //一般設定75
      remUnit: 35
    }
  }

• 同時，在generateLoaders方法中新增px2remLoader

 // generate loader string to be used with extract text plugin

  function generateLoaders(loader, loaderOptions) {
    const loaders = options.usePostCSS ? [cssLoader, postcssLoader,px2remLoader] : [cssLoader,px2remLoader]

    if
 
 (loader) {
      loaders.push({
        loader: loader + '-loader',
        options: Object.assign({}, loaderOptions, {
          sourceMap: options.sourceMap
        })
      })
    }

    // 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)
    }
  }

• npm run dev重新執行