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Command mode belongs to the behavior mode of an object. Command mode encapsulates a request or operation into an object, and separates the responsibility of issuing the command from the responsibility of executing the command through abstraction of the command. The implementation of command mode can provide the functions of revocation and recovery of commands. The specific structure diagram is shown below.梁国彭越这边，差不多也会有十万兵力……若是一起过来，倒还真有些麻烦。Collect从来都不被期待的无名高中吹奏乐部，在一名教师的指导下，以全国顶点的“音乐甲子园”为目标演奏出灵魂的合奏。有些梦一个人无法完成，有些喜悦需要有人分享，这是一个超越时代界限，直击人心的故事。超级小怪兽们来到薇达的家乡，同他的魔法家人和一些小萌新朋友一起庆祝亡灵节，还举行了壮观的游行? The website is changing, the audience is changing, and the creators are also changing. Today's audience is not in the age when information was relatively isolated as we did at the beginning. They are in an information age. The relationship between people on the Internet is getting closer and closer. As a result, they are more and more eager to communicate with others, express themselves, desire others to identify with themselves, and people are less and less willing to be isolated. I can put forward a phenomenon that when a person plays with obstacles, the people around him are also willing to be a repeater, for fear that they will not be able to keep up with the topic and will be despised and isolated. On the barrage, we will find that there are really many repeater machines ~ ~ ha ha. And some of the barrages, to be honest, have already seen bad, but they are still happy to knock on the keyboard and press enter. Finally, I also began to click to close the barrages.