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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:到了晚间，林大爷又接连派人送狗进来。　　全新的天地与道路，可爱的女孩对血缘和命运的回归，寻找发自心底的快乐……　　而霸道学长与基智学弟之间的故事会如何发展，他们二人又会擦出怎么样的基情火花呢There are a lot of them肌肤相触，陈启还没有反应过来，嘴唇就感到一个柔软温润的东西贴过来，是吕馨的嘴唇。大理王子段誉（金基范 饰）从小酷爱琴棋书画，却对家中的武林绝学毫无兴趣。他不满家人介绍的对象，于是逃走，遇见了可爱少女钟灵，随后开始他传奇的江湖生活。丐帮帮主乔峰（钟汉良 饰）义薄云天，武功盖世，率领丐帮，威震中原武林。无奈一个长老的离奇死亡，揭开了乔峰不为人知的身世之谜。从此丐帮帮主的人生起了一百八十度的转变。少林寺底层和尚虚竹（韩栋 饰）从小在少林寺长大，敲钟念佛，慈悲为怀。一次随着师傅的出游，歪打正着解开了一个几十年未有人解开的棋局，竟得到武林前辈的一生绝学，更遇上让他一生难忘的女人。三人后来结成了义兄弟，一起经历着江湖的风风雨雨。