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Why is the subsequent event no longer sent to the sub-View? The answer is in the source code. Next, we will begin to analyze the source code.CW的《吸血鬼日记 The Vampire Diaries》及《吸血鬼始祖 The Originals》共同衍生剧《吸血鬼后裔 Legacies》背景设置在Salvatore学校里，17岁的Hope Mikaelson（Danielle Rose Russell饰，狼人﹑吸血鬼 ﹑女巫三重混血种）﹑Alaric Saltzman的双胞胎Lizzie﹑Josie，及其他拥有超自然血统的的年青人在此既可能建立起自我，亦可能被冲动所蒙蔽。所以他们究竟会成为英雄，还是如血统本质下成为反派？而他们的行为都在校长Alaric Saltzman（Matthew Davis饰）的监督之下。江南之地怎么能够满足呢？尹旭将来的目标必然是北上逐鹿中原，现在这些正是在做准备。黄豆等人便告退。黎章也就罢了——他早就听何霆说过此事，那胡钧和汪魁完全被这天上掉下来的馅饼砸晕了头。The policy mode is the packaging of the algorithm, which separates the responsibility of using the algorithm from the algorithm itself and delegates it to different objects. Policy patterns usually wrap a series of algorithms into a series of policy classes. To encapsulate the policy pattern in one sentence is to "encapsulate each algorithm into a different policy class so that they can be interchanged". The following is the structure diagram of the policy mode:我现在真算是服了你。