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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:National key scenic spots. It is a barrier to the north of Quanzhou City, with an altitude of 498 meters and an area of 62 square kilometers. The main scenic spot is 3 kilometers away from the urban area. The wonder of Qingyuan is based on stones, and the spirit of Qingyuan is based on springs. Yuan people praised "the first mountain in Penglai, Fujian Sea". "Qingyuan Dingzhi" is one of the ten sights in old Quanzhou and has always been visited by tourists. According to Quanzhou government records, Qingyuan Mountain was first developed in the Qin Dynasty. In the Tang Dynasty, "Confucianism, Taoism and Buddhism" competed for land occupation and management. It had traces of Islam, Manichaeism and Hinduism and gradually developed into a famous cultural mountain with various religions. The scenic spot is full of flowing springs and waterfalls, strange rocks and caves, green peaks and trees, The cultural landscape dominated by religious temples, temples, literati academies, stone treasures, stone carvings, stone structures, stone carvings and other cultural relics is found in almost every corner of Qingyuan Mountain. There are 7 and 9 large stone carvings of Taoism and Buddhism in the Song and Yuan Dynasties, nearly 600 cliff carvings in past dynasties, 3 granite wood-like Buddha chambers in the Yuan, Ming and Qing Dynasties, and the pagoda of modern eminent monk Master Hongyi (Li Shutong) and Master Guangqin. Since ancient times, Qingyuan Mountain has been famous for its 36 caves and 18 scenic spots, especially Laojun Rock, Qianshou Rock, Mituo Rock, Bixiao Rock, Ruixiang Rock, Huruquan, Nantai Rock, Qingyuan Cave and Cien Rock. Among them, six Qingyuan rock statues in Song and Yuan Dynasties, represented by Laojun Rock, are listed as national cultural relics protection units.　　多年后，黄鹰又为小说《天蚕变》再续前缘，创作小说《天蚕再变》。Class Program