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To give a comprehensive example, you can look at it according to the above figure. According to the source channels of users, do targeted germination retention. For example, this source channel is a red envelope download from Android application market or a bonus game on WAP side, so this part of users can be considered as profit-seeking, and there can be corresponding profit-seeking activities on the landing page of the client, which can improve retention.In the above code, we use three functions, order500, order200, orderNormal to handle its own business logic, If the current own function cannot handle things, We pass it to the following function to handle it. By analogy, Until there is a function that can handle him, Otherwise, the responsibility chain mode will leave the chain directly, telling that it cannot be processed and throwing an error prompt. Although the above code can be used as the responsibility chain mode, we can see from the above code that the Order500 function depends on functions such as Order200, so there must be this function, which also violates the open-closed principle in object-oriented. Let's continue to understand writing flexible and detachable responsibility chain nodes.柳垂金线，翠带飘扬，在清亮的河水上方荡漾，不时有几根划过水面，伴着潺潺的流水声欢笑。上世纪二十年代，陕西西南的青木川贫穷落后。马帮之子何辅堂为报父仇，卧薪尝胆终于杀了刘庆福，了却家仇。原民团团长魏正先与何辅堂为敌。何辅堂审时度势，假意投奔了巨匪王三春。在多方势力倾轧中，何辅堂独善其身，并阴差阳错地救了魏正先的妻子程立雪，程立雪有感青木川的秀美与落后，决心留在青木川教书，开启民智。然“夺妻之恨”更令魏正先恼羞成怒，他借“剿匪”为名，挑拨正在汉中驻扎的国民党军犯境青木川，何辅堂趁机将巨匪王三春献于民国政府，免除兵燹之灾。魏正先决意孤注一掷，欲将青木川夷为平地。关键时刻，何辅堂毅然投奔解放军，迎来了青木川的和平解放。在何辅堂的努力下，青木川得以在万马齐喑风雨如晦的年代免受战乱之苦。《极限挑战第八季》是东方卫视推出的互动励志体验类节目，节目以“一起挑战，共向未来”为主题，通过对更多社会横截面的记录，为观众传递快乐。Nine, tensioning film how to model?昔年形势所迫，不得已行刺尊驾，为此深表歉意。