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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:唐代经历武后乱政、安史之乱后迎来一段太平盛世。及至代宗，朝中形成两大势力，分别是以代宗堂兄晋王为首的一众文臣，与汾阳王郭子仪所领的一众武将。郭暧与秦风结成莫逆，更与性格内向懦弱的晋王独子李修文成为挚友，三人极其投缘，堪称“尚武三杰”！升平公主是先皇后所出，深得代宗宠爱。先皇后先后诞下升平和太子李适后便病逝。代宗对这双儿女甚为溺爱，从而形成升平刁蛮任性的性格。反恐演习开始了，于海鹰的眼前走过千军万马，回首二十年，往事似云烟，却又分明历历在目……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.　　高原雪山脚下，小提琴手文峰（李至正饰）与神秘女子朵拉（谭卓饰）之间一个浪漫的邂逅之吻，竟让文峰成为了万中无一的吻瘾者，他的生活自此因对吻的迫切渴求而陷入困境，只得再次踏上高原探寻答案。一个时空交错的凄美爱情故事就此拉开帷幕……林为零发现了更大的秘密：自己原来并非林甚鹏的亲生女儿，一切源于上一代的恩怨纠葛，自己陷入其中而不自知，还害了自己最爱的胡骞予和胡欣。恒盛岌岌可危，最后关头林为零挺身而出....