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This.parent = parent;For more information [4]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:谁让东来冒冒失失，瞧见人家母子俩偷情呢？无意间惹下了祸事。3. Using onConfigurationChanged method instead of onRestoreInstanceState to realize data recovery logic, the more advanced nature is the idea of performance optimization and real-time monitoring.Try the upper body effect after drying,Netflix科幻剧《#迷失太空#LostinSpace》宣布续订第三兼最终季,预定2021年上线。