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龙陵中共地下党负责人、抗日游击队政委蔡凤琴，奉滇西特委指示，掩护、配合代号“蝴蝶”的重庆特工沈丽萍查找日军情报机构“芒市一号”。沈丽萍在蔡凤琴掩护下，以中医世家身份为掩护，借给岛田治眩晕病机会，赢得岛田信任。他当时也这么问香荽，香荽的回答惊得他半天说不出话来。余杭城内有个沈皮匠，生下一对孪生子，当晚却被蒙面人用一女婴掉包换走一个男婴。继而又是连遭追杀，只得隐姓埋名亡命天涯。皮匠一家不幸卷入一场残酷无情的宫廷阴谋之中，原来，当朝皇上虽有三宫六院七十二嫔妃，年过半百已连生二十六位公主，竟然未得一子。宁妃和凤妃两宫为争宠，谎奏已怀龙种。几番折腾后，宁妃却又生下了女儿，百般无奈只得将女儿用掉包计换来皮匠之子顶替。而凤妃却孕都没有怀上，只得抱来妹妹的儿子充数没想到十六年后却发生了一系列的事件Description: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:(2) Detection of control coil. The detection of the control coil of the time relay is shown in the following figure.