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　　天音跟随AYA来到剧团，她完全不知道等待自己的是怎样不可思议的命运…Regarding China's economic development, the 19th National Congress of the Communist Party of China made an important judgment, that is, China's economy has changed from a stage of high-speed growth to a stage of high-quality development, and is now in a key research period of transforming its development mode, optimizing its economic structure and transforming its growth power.A4.1. 2.4 lens, vitreous body.A long, a short, a long, a short sound.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:该剧集利用粉丝写给名人的信件，回顾这些极具影响力的人的生活。