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Public class MySubject extensions AbstractSubject {《High School: Love On》是一部青春幻想浪漫成长电视剧，讲述变身人类的天使与热血高中学生们爱情、友情的故事。乡村不仅有传奇的爱情、更有村干部和相亲们的的鱼水之情，在新疆有一个小村庄这里生活着一群善良勇敢、充满希望的人们，他们在村支部的带领下争创乡Cross-country road conditions are more complicated, with gravel, woods, grass, cliffs......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:雪花飘落，寒风萧瑟，四重奏的悠扬旋律荡涤且治愈着他们每一个人的心……在大明及大清属国中落得如此下场的，琉球不是第一个，也不会是最后一个，但绝对是最彻底的一个。