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A. Speed skatingFrom 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:　　如薇和有彥的愛情很平凡，但在平凡裡藏著點點滴滴的不平凡。澳大利亚剧集《Harrow》由Stephen M. Irwin和Leigh McGrath创作，讲述了一位不普通的司法病理医师Daniel Harrow医生（《不死法医 Forever》的男主Ioan GruffuddGruffudd饰）的故事。他聪明﹑不走寻常路，而且可能是一个谋杀犯？他蔑视权威但为受害人尽心尽力，让他解决了一个个奇案；他能让受害者开口说话，但为了寻求真相他不惜一切代价。而一个他过去的秘密威胁到了他的家人、事业和他本人时，Harrow需要尽他所能掩埋一个凶案的秘密。季布介绍之后，才知此人乃是项羽麾下第一猛将龙且。10,000 Yuan Zhang Yi's "Sichuan Changhong Struggling with" Depth "Editor: Wang Lifeng讲述了虎啸镇派出所所长郑路生准备调回市局，局里安排办案经验丰富但执法严厉的吴迪接替郑路生。面对社会转型时期暴露的问题，郑路生与吴迪展开普法教育，解决村民见的矛盾纠葛，让虎啸镇在法制道路上坚实迈进。