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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.这是让他们回去给书院报信了。故事发生在北极附近一个前不着村后不着店的小镇，两个年轻人在这里相遇并坠入爱河。毫无疑问，这是一次人才真空期，在无数的战乱、党争之后，便是泱泱中华，也没有人才补上来了。光头笑问道：公子，直接开炮轰了不就好了？那可别，咱们可不能滥伤无辜。希望村的小学破烂不堪，村中在外当老板的杨刚答应了赞助十万块钱，村长经过斟酌，让憨厚朴实的钢蛋去城里拿回捐助款。在进城的长途车上遇到了拦路抢劫的一帮笨贼，和一位救子心切的父亲路四林，二人合力把劫匪赶下车，在混乱之中，钢蛋和路四林的物品应差阳错的被调包。结果，没帮上忙，自己反倒被打下山崖。