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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:0 declares the event myDoSth, the type of which is the delegate DoSth一路上冒顿全力狂奔，寄希望能够在越军合围之前，突围回到草原。+= is to inform you when this event occurs, and -= is to inform you no longer when this event occurs.荥阳，临时汉王府。13岁的霍莉·霍比和她的家人住在柯林斯维尔，这是一个风景优美的北美小镇，有着主要的街道价值。每一集都讲述了霍莉努力让世界变得更美好，同时应对成长中的日常挑战– 从欺负到突破，从镇压到宵禁。霍莉’第一季的主要任务是拯救苦苦挣扎的花布咖啡馆é 她和艾米（从两岁起就是最好的朋友）的关系受到了新来的女孩派珀的考验。霍莉是一位崭露头角的歌手/词曲作者，由霍莉（Ruby Jay，485k IG followers）演唱的朗朗上口的原创音乐将每一集联系在一起’霍利现场表演中的故事情节’我们在咖啡馆的公开麦克风活动é.　大一新生李珍欣因为想成为一名语言治疗师，来到大学后发现同学对她都很不友好，除了一名叫尤美的学生，两人很快成为了好朋友。珍欣在入住的宿舍楼不断听到奇怪的声音，还有袭击珍欣的黑衣人，幸好最后被尤美救出，与此同时尤美的身份也随之被解开…