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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.不过众人不约而同有着同样一个想法，那就是尹旭所说的南方的舞台。途中，珊灵偶遇送快递的小伙赵子喜，更离奇的是赵子喜开启了神秘的画卷，接下来，发生了一些不可思议，让人大吃一惊的事情…六胞胎就这样默默走上归途。Raw--> mangle--> nat