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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.好在有钱能使鬼推磨，李斯和尉缭当时重金贿赂了一名燕国将领。一位已婚的好莱坞特工收到一封关于匿名性接触的神秘信件，并陷入了一个充满谎言、不忠和数字数据的险恶世界。Peripheral interface circuit part项羽赶忙上去为其顺气，劝慰道：范老先生，夜凉了，回房休息吧。