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Although the above code can meet the requirements, it is not easy to expand and difficult to read. If I want one or two conditions in the future, if I want to recharge 300 yuan successfully, I can win the 150 yuan red envelope, then I have to change the code inside at this time, so the coupling between business logic and code is relatively high, and I accidentally correct the wrong code. At this time, we try to use the responsibility chain mode to transfer objects in turn to realize it.此剧讲述了认识20多年的青梅竹马在两个星期内同居并渐渐了解对方心意的音乐爱情故事。是一段“渐于爱情与友情”的心动罗曼史故事。格雷西的母亲是一名出色的联邦特工，在一次任务中不幸殉职。格雷西（桑德拉•布洛克 Sandra Bullock 饰）长大后继承了母亲的事业，也成为了一名联邦特工。格雷西从小就脾气刚烈、不修边幅，作为“假小子”的她并不受欢迎，只有她的拍档兼好友艾瑞克（本杰明•布拉特 Benjamin Bratt 饰）理解她。Selected from: FuturismToday, the two female reporters of the NPC and CPPCC took the screen by surprise, which is really a long story. However, in recent years, in order to gain the opportunity to interview the NPC and CPPCC, female journalists have indeed emerged one after another in robbing news.　　讲述了忍者神龟与蝙蝠侠跨时空相遇，他们本都是默默守护正义的使者。然而在铲除罪恶的过程中蝙蝠侠和忍者神龟产生了误解，经过一系列打斗后，解除彼此的误解，共同作战，守护城市的和平以及人们的安全。The propagation of events is directed. When a button is clicked, the event generated starts to propagate upward from the button (just like a blister comes up from the bottom of a cup, which is why it is called event bubbling), but this event always looks for whether a specific attribute has a value. For example, the click event of a button first looks for a meaningful definition of whether there is an onclick attribute on the button (i.e. The attribute points to an existing function or an executable statement), and if so, executes the function or statement; The event then continues to propagate up to the upper layer object of the button (for example, a form object or document object, which in short contains the parent object of the button). If the object also defines the onclick attribute, the value of the attribute is executed.