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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:《迷宫行者》讲述了男孩托马斯（Dylan O’Brien 饰演）醒来时发现自己身处一个由巨石组成的巨大迷宫Glade中，他只记得自己的名字，其他一切记忆全都失去了。和他一样在这个迷宫中的还有一些孩子，他们也同样不记得自己是怎么到这里的。每天早晨迷宫的大门会被打开，而到了晚上就会关闭，迷宫中有一种可怕生物叫做Grievers。每隔三十天，就会有一个新的男孩到来，但令人意外的是，在托马斯之后来的却是个女孩，她带来了令人惊讶的讯息：只有托马斯才能带领大家走出迷宫，而前提是托马斯必须首先解开埋藏在他记忆深处的黑暗秘密。清道光年间。漫天风雪的关外。一对年青夫妇带着一年仅七岁之孩童涉水逃命，后面追来的，是以武当第一剑客高俊忠为首的一群朝廷中的超级高手。夫妇奋勇抵抗，二人武功虽高，然寡不敌众，终在草料场里被围，一场大火，少妇为救夫战死，男人亦身受重伤，只剩下头部受了重击而藏在远处山洞里的儿子，在雪地上寻找着双亲！少妇，正是严咏春（陈秀雯饰），男子，正是洪熙官（卢惠光饰），而那患了失忆的儿子，正是洪文定。公元1735年乾隆（霍建华饰）即位，与他少年相知的侧福晋如懿（周迅饰）也依礼进宫为妃。从此，二人在宫廷里演绎了一段从恩爱相知到迷失破灭的婚姻历程。新帝登基，如懿因与乾隆青梅竹马的情分成为娴妃，由此受到众人排挤，而太后（邬君梅饰)又与如懿家族有世仇，如懿危机四伏。此时，乾隆也同样面对太后掌权和老臣把持朝政的难题。权力更迭过程中，乾隆与如懿互相扶持，共同渡过难关，直到二人扫清障碍。乾隆经过多年努力也如愿将如懿推到皇后位置，与他共有天下。然而做了皇后的如懿却发现，乾隆已从少年夫君成长为成熟帝王，他的多疑善变以及帝王自私不断显露，两人间的情意信任渐渐破灭。但如懿依旧坚守美好回忆，恪守皇后职责，直到去世。(2) When there is an outward fishing gear and its horizontal distance from the side of the ship is more than 150m, a ring lamp or a cone shape with an upward tip shall be displayed in the direction of the fishing gear;Looking for customers is definitely not a aimless search. What we are looking for should be the target customers. Of course, we also need to make preparations in advance and carefully locate the target customers. What kind of people are our products suitable for, what kind of enterprises are useful to, and who are interested in our products now. Combined with these thoughts, the scope of customers is roughly delineated. Then, through the Internet and Yellow Pages, the information of the target customers is preliminarily mastered, and then the next marketing plan is prepared.