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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:十年没见的儿时鼻涕虫玩伴林南一，竟长成了超级帅哥，可他会不会揭开过往自己的糗事，让刚树立的“女神转校生”形象覆灭？转学回乡的少女童夕，就这么在兴奋和紧张中开启了自己“开挂”的高中生涯。但她不知道的是，林南一也有一个隐藏十年的秘密，而他还有一个让童夕惊羡不已的身份......一段充满浪漫和乌龙的校园青春故事就此展开。看着龙纹玉坠，一脸沉思。官方宣布第二季刚开始听到项声禀报的时候，他还有些不相信，不相信这个世界上会有人能够以少胜多，以如此悬殊的比例逆转胜过西楚军。