这个命令会在监视模式下运行编译器，启动开发服务器，在浏览器中启动我们的应用， 并在后续构建《英雄指南》过程中，应用能持续运行。
This command runs the compiler in watch mode, starts the server, launches the app in a browser, and keeps the app running while we continue to build the Tour of Heroes.
在附加模式中，集成测试客户端监视和模拟组件，并在模块运行时进行连接，但是它不是先调用组件，而是外部源执行调用。
In attach mode, the integration test client monitors and emulates components and wires as a module runs, but it doesn't first invoke a component; instead, an external source does the invoking.
表快照和动态sql快照是信息量很大的快照，在在线模式中需要花些时间从监视的实例获取这些信息。
The table snapshot and the dynamic SQL snapshot are more expansive snapshots, and in online mode it can take time to get the information from the monitored instance.
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