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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:　　陈重、李良、王林是从同一间大学宿舍走出来的兄弟……正是因为他们的拖延，使得项羽暴怒，本来对楚怀王的那一丝愧疚和怜悯烟消云散，取而代之的是无尽的冷酷。描述了一个叫孙的债主向阿尔泰讨债的故事。他是能讨债还是会被债务人动摇心？Lins Concubine 01李天杨本来是一个性格开朗，充满阳光，秉持着中国传统美德的中国八零后青年。他高中毕业后留学德国，遇见了令人心动的德国女孩索尼娅。可是当他得知为了筹集自己的学费父亲积劳成疾后决定回到国内靠自己的努力帮助家庭渡过难关。在国内他发挥自己的能力，从打零工做起，一步步进取，不断实现着自我。四十岁的精神病医生梁国辉被初步确诊为肺癌，生命，只剩下半年的时间。梁国辉的妻子郑洁，是中心医院重症监护室的主任。正忙着落实梁国辉的工作调动问题。作为丈夫，作为孩子的父亲，郑洁对梁国辉的评价就三个字：不合格！她认为如果梁国辉继续在精神病院干下去，日子就没法过了。梁国辉瞒着家人让铁哥们儿李长江立遗嘱。李长江哭了，说既然老天爷给了一个大限，就做你最想做的事吧。梁国辉语出惊人，说我想休妻！死亡的恐惧和生存的烦恼同时折磨着梁国辉。就这时候，阳光一样的华硕走到了梁国辉身边。