自动排除mock

生产环境，使用webpack的条件编译自动排除mock数据

src/main.js

@@ -24,11 +24,9 @@ import * as filters from './filters' // global filters
  * you want to use MockJs for mock api
  * you can execute: mockXHR()
  *
- * 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').default
   mockXHR()
 }