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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.Map of the area where the body was foundThe adapter for the interface is as follows: Sometimes we write an interface with multiple abstract methods, When we write the implementation class for the interface, All methods of the interface must be implemented, This is obviously wasteful at times, Because not all methods are what we need, Sometimes only a few are needed, In order to solve this problem here, we have introduced the adapter mode of the interface. With the help of an abstract class, the abstract class implements the interface and all methods. However, we do not deal with the original interface, but only get in touch with the abstract class, so we write a class, inherit the abstract class and rewrite the methods we need. Take a look at the class diagram:投秦皇嬴政之所好，又有扶苏公子求情。　　片中的电影剧组汇聚了本·斯蒂勒饰演的著名动作明星、小罗伯特·唐尼饰演的曾三次获得奥斯卡奖的演技派影星和杰克·布莱克饰演的以一人分饰多角为特色的流行喜剧演员。唐尼饰演的演技派明星为了挑战自己的演技决定将自己全身涂黑出演越战中的黑人角色。然