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,