现在很多软件都具有在线升级更新的功能，这是个很早时候写的代码，不过原理是一样的，它就是实现了软件在线更新的功能，并显示出下载进度和更新进度等。-Now many software updates have online features, this is a very early time to write the code, but the principle is the same as it is to realize the software online update feature, and display the progress of the download and update the progress.