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This principle means that there are no methods in each interface that subclasses cannot use but must implement. If not, the interface must be split. It is better to use multiple isolated interfaces than to use a single interface (an interface where multiple interface methods are assembled into one).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.The 24th Olympic Games in 1988 was included in the official competition.很多事情，尹旭一眼就能看出来。直至后来，往来蛮夷愈发猖獗，福建巡抚实在受不了了，朝廷复又在澎湖设司，荷兰人听到了迟到的呼喊前来侵占，郑王爷又夺了回来。刀客刀锋连斩，刀法更加凌厉，也更加毒辣。A. Database Download Operation