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大局已定，签订封神榜吧。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:One is a war, the other is a performance to pull cigarettes.The life cycle of an object is managed by Spring, which directly obtains an object from Spring. IOC is the abbreviation of Inversion Of Control, just like control is handed over to Spring from its own hands.小葱心下恍然，便不再问。