源代码较简单，适合初学者学习。这的原理是根据新建的原始套接字构造ICMP协议的ECHO数据头，然后分析返回的IP及ICMP的数据头。代码较简单，适合初学者参考。-Source code relatively simple, suitable for beginners to learn. This principle is based on the new socket structure of the original agreement, ECHO data ICMP header, and