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3. Basic Handling of Activity Exception这本是一件很有难度的事情，没想到这么快就有了眉目。韩剧《城市猎人》改编自日本著名漫画家北条司的同名漫画，并将舞台由原著中的上世纪80年代东京搬到2011年的首尔。全剧描述韩国内部社会事件，男主人公李润成为MIT（麻省理工学院）博士出身的国家地图通信网小组成员，女主人公金娜娜因交通意外失去父母，但凭借自己的努力成为青瓦台特工，二人帮助人们化解各种困难和危机，同时也上演了一段浪漫的爱情戏。想被疗愈的男人Write test code in "TestSpring" and run:Car=make _ car ('subaru', 'outback', color= 'blue', tow_package? = True)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: