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一听李左车提及蒯彻以及其为人和过往的事迹，韩信立即动了心思，简直就是心痒难耐。《快乐再出发》节目组针对快男们对自己团综的策划，结合实际预算“降级”处理， "凑”出一次圆梦之旅。边走边唱成固定项目，快男们将自主设计这迟到的15年的团综，在高度自由向度下，将如何把自己安排的明明白白，这注定是一场充满离谱和意外的爆笑之旅Http://www.jiemian.com/article/2067099.htmlI. Dangerous Sports Business ActivitiesLet's start refactoring it step by step. The first step is still to provide the window.external.upload function to simulate the creation of the upload plug-in on the page. This part of the code has not changed: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: