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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:该剧主要讲述了高中时期被同学们排挤的男主人公为了救活死去的初恋而穿越回自己的十八岁的故事。Archery, Boxing, fencing, Skin boats, trampolines, Judo, rowing, Swimming (fin swimming), Life-saving (life-saving on water), Shooting, wrestling, sailing (windsurfing), parachuting, powered umbrella, traction umbrella, gliding (paragliding, gliding, hanging gliding), hot air balloon, mountaineering, rock climbing, bungee jumping, exploration, automobiles, motorcycles, motorboats, crossbows, water skiing, martial arts (including Sanda), taekwondo, bodybuilding, aerobics, sports dance, rafting, surfing, diving, airships, light planes, sports yachts, karate, Shebin sports, horse racing, exploration, golf.源自于网上仅两句内容的恐怖故事，例如「我手机上有张我在睡觉的照片。我是独居的。」这类在一个离中缅边境不远叫作禅达的地方，一群来自五湖四海、不同出身不同身份甚至是不同政见的溃兵和百姓，因为种种命运际遇的原因而相会于此：北平人孟烦了、军医郝兽医、湖南兵不辣、上海军官阿译、东北佬迷龙、豆饼、要麻、蛇屁股、康丫、川妹子陈小醉。战争的苦难和身体的伤病让他们过着绝望的日子，他们互相厌憎又相依为命，不饿死不病死成为他们每天生存的最高目标。为了在严酷的战争环境下生存下来，别无选择的他们不得不摒弃前仇、恩怨、偏见、狭隘而团结一致组成一支小分队，在现实的困境中他们认识到了民族存亡的大义，于是义无返顾共同投入到打击日本侵略者、保卫家园、捍卫尊严、为抗战胜利不惜付出生命代价的正义斗争中，用血肉之躯书写一曲曲铁血卫国的悲壮战歌。赵耘也在，他听了胡敦的话，忍不住怒道：胡大夫，孰是孰非，等玄武侯到了，皇上自然会决断。Weng Siliang informed the buyer that he had called in more than a dozen Indonesian sailors to take over the "Changsheng Wheel", while the 18 gangsters returned to the mainland of China on the receiving ship.