事实上，Web应用程序层可能完全由一个或多个Web服务实现，这样应用的URL只会把浏览器组件暴露给用户。
Indeed, the Web application layer might be realized completely by one or more Web services such that the application URL would only give the user a browser component.
在服务器上运行这个页面，您将在这个浏览器中看到这个组件描绘器，如先前 图 12 所示。
Run the page on the server, and you will see the component renderer in the browser, as shown previously in Figure 12.
当您有一个长期的任务时，这个组件就显得十分方便，要么在这个服务器上，要么在浏览器中，而您不会让用户对这个应用软件是否在工作表示怀疑。
This component comes in very handy when you have long-lasting tasks, either on the server or in the browser, and you don't want to leave the user wondering whether the application is working.
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