请看注释啊！！！

/**
* If you don't want to use mock-server
* 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 ! ! !
*/
// if (process.env.NODE_ENV === 'production') {
//   const { mockXHR } = require('../mock')
//   mockXHR()
// }

呃......好吧
我来告诉你
vue.config.js
before: require('./mock/mock-server.js') 如果不需要mock，直接删除或注释; 然后你在main.js 把 mock代码块删除或注释.
然后，你就可以愉悦的开发了。。。

同问，代码和文档不匹配了

before: require('./mock/mock-server.js')

请教下，我记得文档里说可以逐步替换mock接口的，这怎么做到的