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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:自古以来，如有奇人问世必天降异象。据说“隋炀帝”杨广出生的当天晚上本来皓月当空，明月如镜。当深宫中传来一声婴孩啼哭声之时，突然雷声大作，刹那间天昏地暗，倾盆雨注… 一座古色古香、雕梁画栋的高大仿古建筑坐落在北京和平门外琉璃厂西街，那便是始创于康熙十一年，迄今已有三百余年的历史老字号松鹤斋……(12.06 update)香云她们主仆是肃王府什么人呢？见他发呆发怔，小葱想起刚才那女子一直素纱遮面，中间听到赵锋喊不行二字的时候，又准备回避的情形，脱口而出道：糟了。阿欢从小就有一个很“废”的超能力：挨一耳光就能看见他和别人剩下的见面次数。一次意外让他深信，一旦突破了次数的限制就会带来厄运。从此阿欢得过且过，游戏人间。而青梅竹马的晓彤和阿欢的见面次数高达一万多，他本以为注定是一生的伴侣，所以毫不珍惜。直到有一天，阿欢发现自己和晓彤的见面次数只剩下几次，好哥们阿伟也要离他而去。他意识到自己必须做出改变。阿欢能否打破命运的魔咒呢？1. There are two options to manage the creation and destruction of state objects. The first is to create and then destroy state objects only when they are needed, and the other is to create all state objects from the beginning and never destroy them. If the state object is relatively large, the first method can be used to save memory, which can avoid creating some objects that will not be used and recycle them in time. However, if the state changes frequently, it is best to create all these state objects in the first place, and there is no need to destroy them, because they may be used again soon.