通讯录示例 这是取材于《网络程序设计基础》上的一个例子，每一个人可以注册，同时留一个密码，将来可以用该密码来管理自己的信息。-An example on " procedure design basis of the network " that address book example draws materials like this, everyone can leave a password at the same time, can manage one s own informa