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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:张槐微微皱了下眉头，沉思了一会，才对板栗道：你这么处置，很不错。板栗看着她冷清的面容，心想如果可能，她更乐意去大雪山下帮故国的百姓看病吧？无所求，无所谓。求收藏求推荐票票。司马光识破了盛三的阴谋,帮助刘老伯完成心愿,在香会上欣赏到儿子阿福精彩的舞狮表演,并帮助巧云姑娘摆脱了地主的无理刁难,最后在静居寺潜心静修,最终成为伟大的政治家,文学家和史学家……《佼个朋友吧》是东风卫视的一档娱乐节目播出时间：星期三 23：00 主持人：黄子佼大苞谷折腾出来的事就够他们忙的了，他那个鲨鱼小舅子还没放出来呢。