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欲用其利，先挫其锋。艰难困苦，玉汝于成。Technical Requirements杨长帆眯眼一看，正是之前来要饭的徐什么长，几日不见，换了一件体面点的衣服。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:为了打造千骑系统，天津垓指使亡去给灭亡迅雷站送密钥，与灭的接触以及天津垓对待属下的恶劣态度，让亡动摇不已。千骑诞生后，功不可破的亡却并没有得到好下场……\"如果您喜欢这部作品，欢迎您来投推荐票、月票，您的支持，就是我最大的动力。