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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:洪霖恢复清冷面容，淡淡地对小葱道：在下和白兄这就出去。专业冲浪者兼梁上君子凯特·钱伯斯（波碧·蒙哥马利 饰）回到宛若天堂的南太平洋礁岩岛，阴差阳错成为操办人替富甲一方的副总督处理岛上棘手事务，其过往经历更是让她面对犯罪分子时得心应手。The equipment of China's weightlifting national team is Dowell, but there are also many athletes who buy NIKE weightlifting shoes worth several thousand yuan at their own expense. Only the top athletes can realize the difference.张大栓则抱着玉米，站在板栗跟前，千言万语涌到嘴边，却是一句话也说不出。香儿飞奔过来，一把扯住他，将他往后使劲一推。他却笑嘻嘻地挤到娘身边，讨好地问道：爹，娘，儿子问你们件事。