原文：https://www.jianshu.com/p/891ccd497684

1、environment.prod.ts文件中设置生产环境的接口地址

export const environment = {SERVER_URL: `./`,production: true,useHash: true,hmr: false,config: {host: '/api/',hostfile: '/'}
};

2、environment.ts文件中设置开发环境的接口地址

export const environment = {SERVER_URL: `./`,production: false,useHash: true,hmr: false,config: {host: 'api接口地址',hostfile: '文件存储地址'}
};

lhost.ts使用时

import { environment } from '../../../environments/environment'
export class lhost {static host = (environment as any).config.host;static hostfile = (environment as any).config.hostfile;
}

要在生产环境下使用要用

ng build --prod
ng serve --prod

不带--prod默认是开发环境下使用