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Season 2, Episode 1, Episode 2 or Episode 3. It should be Episode 1这样一来对那几个老牌的诸侯王也是个牵制。Recently, the reporter came to the express service center in a university. Here, the reporter saw that the rows of express delivery shelves were already filled with various small packages early in the morning, and some large packages that were slightly larger and could not fit on the shelves were also spread all over the floor, but these were not all, and the staff were unloading the goods one after another. A courier said that there are usually 156 packages a day, and there are about 12,000 packages on the 13th and 14th after the "Double Eleven".小葱也着忙，遂不敢再动。　　Syfy宣布剧集《#凡妮莎海辛# Van Helsing》续订第五兼最终季，13集最终季将于明年初开机拍摄，预定同年播出。It can be used to divide namespaces and reduce the number of global variables.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: