perf: import mockXHR only in production

src/main.js

@@ -23,8 +23,8 @@ import '@/permission' // permission control
  * Currently MockJs will be used in the production environment,
  * please remove it before going online ! ! !
  */
-import { mockXHR } from '../mock'
 if (process.env.NODE_ENV === 'production') {
+  const { mockXHR } = require('../mock')
   mockXHR()
 }