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郑老太太连声道：黄瓜。We can see the above code. The code for creating div is very similar to the code for creating iframe. We can now consider separating the common code to make the code completely abstract. We can now write a set of code that is encapsulated in the getInstance function, as follows: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:　　1924年，王剑虹病逝。悲痛万分的瞿秋白第二天就出现在了课堂上。瞿秋白因住处遭到敌人的搜查而被迫转入地下活动，杨之华受组织负责与瞿秋白联系，师生加战友的情谊，渐渐升华。在上海工人运动的大潮中，杨之华勇敢的向瞿秋白表白，后者委婉拒绝了她……兰顿和优莱卡的旅程将在哪里结束？　　王志浩身出豪门，却没有半点纨绔气息，心地极其善良。身为LJ集团董事长的父亲王得龙，对志浩总是恨铁不成钢，一方面在内心对儿子充满疼爱和期望，另一方面对志浩的做人做事又处处表示着不满。志浩的母亲善良慈爱，却早早