配置.env.development

# base api
VUE_APP_BASE_API = '/wapi'
BACKGROUND_APPLICATION_URL = 'http://baidu.com'  //域名

配置 vue.config.js

devServer: {
    port: port,
    open: true,
    overlay: {
      warnings: false,
      errors: true
    },
    proxy: {
      '/wapi': {
        target: process.env.BACKGROUND_APPLICATION_URL
      }
    }
    // before: require('./mock/mock-server.js') //一定要注释掉
  },