升级 vue2.6.11 到vue2.7——引入autoImport和vue-components

[lmislm]

1. Install: npm i -D unplugin-auto-import
2. https://github.com/unplugin/unplugin-auto-import
3. eslintrc-auto-import.json需要enable: true编译一次，然后设置为 false
4. vue-cli:

   AutoImport.default({
   // global imports to register
   imports: [
     'vue',
     'vue-router',
     {
       '[package-name]': [
         '[import-names]',
         // alias
         ['[from]', '[alias]']
       ]
     }
   ],
   eslintrc: {
     enabled: false, // Default `false`
     filepath: './.eslintrc-auto-import.json', // Default `./.eslintrc-auto-import.json`
     globalsPropValue: true // Default `true`, (true | false | 'readonly' | 'readable' | 'writable' | 'writeable')
   },
   // Enable auto import by filename for default module exports under directories
   defaultExportByFilename: false
   })