angular2简单上手项目，前置了解

• 显示数据 https://hacking-with-angular.github.io/2016/08/03/displaying-data/
• 用户输入 https://hacking-with-angular.github.io/2016/08/04/user-input/
• 表单 https://hacking-with-angular.github.io/2016/08/07/forms/
• 依赖注入 https://hacking-with-angular.github.io/2016/08/11/dependency-injection/
• 服务 https://hacking-with-angular.github.io/2016/09/18/services/
• 模块 ngModule https://hacking-with-angular.github.io/2016/10/16/angular-module/