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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:……(未完待续。她急忙从袖子里扯出手帕子，仔细地帮小娃儿擦泪，一边想着如何答。　　当失散的小妹忽然有了音信，佳琳选择直面现实，不惜代价争取家人团聚。财阀张墨白的出现为她提供了一条捷径，而站在人生的十字路口，却发现前方有更大的秘密向她招手。为了探究家族没落的原因，佳琳不惜委身张墨白，凭借过人的智慧与努力争取到张墨白的信任，在香港飞速发展的十年，协助他扩展势力，平步青云。张礼红对自己的生活很自信。事业上，公司刚刚经历失去老总的意外，但在她的努力下，公司业务进展顺畅，她将很可能成为新的总经理。一个小女孩和她将死的母亲遇到了一位神奇的厨师——丘奇先生，一段美好的故事展开了。两年后，田清明从知情好友处得知，说司徒水仙生下一儿子，很像他，在国公府过着连狗都不如的日子。