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　　四大版块《“乐”见新鲜》为新闻资讯；《“乐”见榜样》是榜样人物专题片；《“乐”暖人间》平凡人音乐故事的的Vlog展示；《越短“乐”精彩》是新鲜、正能量的短视频集锦。@ Song Yi待听书儿说是她家少爷，不禁一愣：一个少爷给小葱师姐送信干嘛？书儿这回是来谢人的，自然不必遮遮掩掩，于是就将张姑娘救了她家少爷的事说了一遍。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:This actual damage exists between the above levels 3-4.The three teams take turns to play one match each. If the champions who win more are all 1 win and 1 loss, the score is poor...