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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:便站起身，笑道：走，咱们也去拔萝卜。在上世纪二十年代，少女春云为了追求自己的爱情，冲破种种阻碍，终于和心上人方皓民结为连理。可皓民不幸过世，春云毅然面对皓民遗留下来的各种困难，照顾着几个与自己完全没有血缘关系的孩子。她怀着仁慈善良的心，教给这些孩子们为人处事的道理，陪着他们慢慢长大。孩子们开始时并不懂事，经常与春云闹不合，在春云孜孜不倦的教导中，他们一点点地成长起来。但是，奈何春云的舅舅不学无术，教坏了其中一个孩子志强。春云为了让志强回头，不顾一切帮助他，以自己的生命为代价，教会了他做人的道理。最后，一家人围在春云的病榻前，悉心地照顾着自己的母亲。所以，哪怕是天下最恶的恶人面对垂死的燕南天，也被这种精神所震慑。　　陈重和赵悦结婚七年了，赵悦依然不倦地从生活的各个细节求证婚姻的安全程度，她需要的是细致的关心和绝对的忠贞。但陈重渴望的仍是火一样的爱情，就好像他大学毕业时为了赵悦从北京一路追到成都，放弃了父母和前途。[Tian Zi]: I define it as increasing the overall damage, that is, adding an additional multiplier to the total damage.