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这样真的好吗？大家伙开始脑补出各种各样奇奇怪怪的画面。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.秦瀚听了忙忙地穿衣出来看。　　然而，他们居住的世界正被意想不到的强大势力威胁着。2. Dynamically add functions to an object and can also dynamically undo them. (Inheritance cannot do this. The function of inheritance is static and cannot be added or deleted dynamically.)