说明：  Angular 将服务器端开发领域的一些最佳实践用于增强浏览器 HTML，为更加简单方 便地构建富应用程序(rich application)打下了良好的基础。Angular 应用程序围绕模型-视图- 控制器(Model-View-Controller，MVC)设计模式构建
(Angular uses some of the best practices in server-side development to enhance browser HTML for simplicity We have laid a good foundation for building rich application. Angular applications around model view - Design of Model-View-Controller (MVC) design pattern)