• cli2 在 build 文件夹下的 webpack.base.conf.js 里面

• cli3 在vue.config.js

const path = require('path')
function resolve(dir) {
 return path.join(__dirname, dir)
}
module.exports = {
 lintOnSave: true,
 chainWebpack: config => {
  config.resolve.alias
   .set('@', resolve('src'))
   .set('assets', resolve('src/assets'))
   .set('components', resolve('src/components'))
   .set('layout', resolve('src/layout'))
 }
}