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看着签上标注的白首同心四个字，他不禁眼睛潮湿了，以至于看不清下面的句子，其实也不用看了，这是一支上上签。唐朝太宗年间，某夜唐太宗梦见身陷险境，幸得一白衣少年所救。徐茂公解梦，显示将有乱事，须得该少年相助平乱。太宗命张士贵往找应梦少年。原来此应梦贤臣乃大将军程咬金之救命恩人薛仁贵，仁贵带着咬金所赠之令箭投军，期间更误堕地洞而得奇遇…再温柔点……不会。故事发生在上世纪中国第一藏书楼宁波天一阁。清末民初时局动荡，范家主人范榛却一直固守着祖宗留下的藏书。叔涵(黄磊扮演)是他收养的孩子，从小记忆力惊人，他喜欢上了父亲老友林正公的女儿林若云，两人相约私奔，却被家人发现，若云溺水身亡，叔涵流落江湖，遇到了与若云长得一样的混血姑娘明妮(马伊俐扮演)，两人陷入欲罢不能的恋情中。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:5.2 for example/shindig (Carnival)