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船主与叶麻有私仇，这我不管，许朝光不认船主，这我也不管。In fact, the scene we described above is not perfect, Because the target address of the message accessed by the client may not be the local machine, but other servers. When the kernel of the local machine supports IP_FORWARD, we can forward the message to other servers. Therefore, at this time, we will mention other "levels" in iptables, that is, other "chains". They are "before routing", "forwarding" and "after routing". Their English names are(two) the maintenance room meets the requirements of the variety and quantity of fire extinguishers, and the construction area is more than 100 square meters;他被香荽吩咐暂时跟着玉米，而玉米是最爱财的，因此生怕他就答应把自己卖了，遂对掌柜的骂道：大叔钻钱眼里去了？出这个馊主意。洪霖又问道：他们从不请其他人进去？白凡点头道：苏文青是张家的塾师，才得以被邀请。扒开草叶，露出一张阳光的笑脸。From the above command class code, we can see that any operation has an execute method to perform the operation. The above code uses traditional object-oriented programming to implement the command mode. The procedural request call of the command mode is encapsulated in the execute method of the command object. Have we found the above writing code a little cumbersome? We can do this using the callback functions in javascript, In object-oriented, The receiver of the command mode is saved as an attribute of the command object, and the command execution operation is agreed to call the command.execute method. However, if we use the callback function, then the receiver is closed in the environment where the callback function is generated, and the execution operation will be simpler. Only the callback function can be executed. Let's look at the following code: