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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:人是花生派的，他结巴道：你……谁暗害你了？大苞谷道：又不让我见爹娘，又派人跟踪我，想干嘛？哼，不能暗中下手，就派人栽赃，想给我按个罪名。1949年10月1日新中国成立，解放军即将入川，然而，国民党保密局站长何琳在马仁峰的指挥下做垂死挣扎！在蒋介石的最高指示下对蓉城实施大爆炸，在蓉地下党组织惨遭覆灭，与即将入川的解放军失去了联系！小组唯一幸存者叶雅颖接到指示唤醒在国民党潜伏多年的“磐石”，惊然发现“磐石”就是亲兄叶宇飞，而他们的父亲正是国民党叶泽宏将军。父亲也早已对蒋政府心生厌倦，成功接受策反，为和平解放成都打开了第一道大门。叶家兄妹受到了保密局的高度怀疑。蓉站站长何琳与叶宇飞曾是抗日战争时期的恋人和战友，却因两人信念不同，何琳由爱生恨，屡次对兄妹俩痛下毒手。此时潜伏下来的何琳企图暗杀进城解放军首长，并与叶宇飞同归于尽，叶宇飞绝地反击，终结了何琳的生命。最终成都和平解放了，叶宇飞及其地下党人，注视着入城的解放军队伍和欢庆的人民，留下了灿烂的微笑！　　该季仍然10集，将于9月10日播出。4 No parking is allowed within 50 meters at intersections, sharp bends, narrow bridges, bridges, steep slopes, railway intersections and tunnels.那些桀骜不驯的部落首领，被他用各种手段驯服，死心塌地地拥护他为草原的守护神。