外部升级程序(需要主程序的调用),具体代码这里就不罗列了,还是自己看源代码吧.此程序主要的思路是通过读取服务器文件获得升级版本及升级地址,有新版本则下载.-external promotion procedures (need to call the main program), the specific code is not listed here, or your own source code to see it. The procedure is the idea of the doc