1.在environments文件夹中添加各环境的文件（st和uat为测试环境，名字可以随便取）
2. 配置各文件的参数
environment.prod.ts，production: true表示是生产环境
export const environment = {production: true,url: 'api/pro'};
environment.st.ts
export const environment = {production: false,url: 'api/st'};
3.修改angular.json
(1)projects-build-configurations,添加st和uat
"st": {"fileReplacements": [{"replace": "src/environments/environment.ts","with": "src/environments/environment.st.ts"}],"optimization": true,"outputHashing": "all","sourceMap": false,"extractCss": true,"namedChunks": false,"extractLicenses": true,"vendorChunk": false,"buildOptimizer": true,"budgets": [{"type": "initial","maximumWarning": "2mb","maximumError": "5mb"},{"type": "anyComponentStyle","maximumWarning": "6kb","maximumError": "10kb"}]},
不同的地方就是"with": "src/environments/environment.st.ts"， 分别为prod,st,uat
(2)修改serve-configurations
"configurations": {"production": {"browserTarget": "angular6-fundamentals:build:production"},"st": {"browserTarget": "angular6-fundamentals:build:st"},"uat": {"browserTarget": "angular6-fundamentals:uat:st"}}
4.如果是跨域的配置要动态读取配置的接口地址
（1）proxy.config.json
{"/api/dev": {"target": "http://localhost:8080","secure": false,"logLevel": "debug","changeOrigin": true,"pathRewrite": {"^/api/dev": ""}},"/api/st": {"target": "http://st:8080","secure": false,"logLevel": "info","changeOrigin": true,"pathRewrite": {"^/api/st": ""}},"/api/uat": {"target": "http://uat:8080","secure": false,"logLevel": "info","changeOrigin": true,"pathRewrite": {"^/api/uat": ""}},"/api/pro": {"target": "http://pro:8080","secure": false,"logLevel": "error","changeOrigin": true,"pathRewrite": {"^/api/pro": ""}}}
（2）接口服务中引入配置环境的js
import {environment} from "src/environments/environment";
/*** get请求* @param info*/status(info: Object): any {alert(environment.url);//return this.http.get("/api/API/Status");return this.http.get(environment.url + "/API/Status");}
（3）如果要启动st测试环境，ng serve -c st
