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葫芦这才想起来。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:　　秀兰为了支持青山贷款，去给银行行长家当保姆，青山贷款买来设备却发现被人骗了，二虎帮青山重新买回设备。加工厂办起来了，青山经营得当厂里经济效益很快提高，却意想不到出现了牛老板。牛老板要大投资和喜家庄联营。喜耕田对牛老板有看法，不同意和牛老板合作，于是闹出了新的麻烦。　　秀兰为了支持青山贷款，去给银行行长家当保姆，青山贷款买来设备却发现被人骗了，二虎帮青山重新买回设备。加工厂办起来了，青山经营得当厂里经济效益很快提高，却意想不到出现了牛老板。牛老板要大投资和喜家庄联营。喜耕田对牛老板有看法，不同意和牛老板合作，于是闹出了新的麻烦。According to Dr. Jin, if a woman suffers from urethritis, has blood in her urine, has taken hormone supplements, has just miscarried or has given birth for a few weeks, etc., she may also be tested with a pregnancy test stick, and the result may also be false positive, thus deceiving the doctor.In the last article, we have learned how to use the iptables command to view rules, so in this article we will summarize how to manage rules.JD.com Promises