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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:阿良良木历（神谷浩史 配音）正在为了即将到来的考试进行着刻苦的准备，一次偶然中，阿历发现镜子里竟然映不出自己的身影，惊慌失措的他找到了专门研究不思议事件的斧乃木余接（早见沙织 配音）和影缝余弦（白石凉子 配音），让阿历没有想到的是，两人竟然告诉他，他即将要变成吸血鬼了。File://: file data format, followed by file path.黄斌，中国大陆的头号通缉犯，多年前逃难到香港，加入到国际犯罪集团，并且经过多年的拼搏一直爬到了集团首脑的位置，当年黄斌逃难到香港之初被阿虎舍身救了一命，从此黄斌便记住了阿虎的救命之恩，对阿虎以兄弟相待，一起出生入死。本对阿虎信任有加，但自此电影院事件以后，黄斌对阿虎有了芥蒂，心中不由得开始提防……Production in Chinese: Cultural Zone