This event handler is called at the very beginning so that the initial screen contents can be set to be viewed.
在刚启动时调用这个事件处理函数，将初始屏幕内容设置为可见。
When one of these menu text items is clicked, then the corresponding onclick event handler makes the corresponding screen appear in the browser window.
当单击这些菜单文本项时，对应的onclick事件处理函数让对应的屏幕出现在浏览器窗口中。
The ViewHandler factory calls the corresponding view handler based on the screen name.
ViewHandler factory根据屏的名称调用相应的视图处理程序。
The handler uses a support class LoggingWindow, which puts the exception up on the screen.
处理程序使用了一个支持类LoggingWindow ，该类将异常显示在屏幕上。
The handler uses a support class LoggingWindow, which puts the exception up on the screen.
处理程序使用了一个支持类LoggingWindow ，该类将异常显示在屏幕上。
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