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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.这个王大姐厉害。　　老一代运动员退役，新一代以更开放和包容的姿态站上舞台，在冰面上，两代运动员完成了体育精神的接力和传承，而陈冕也已经做好准备，代表中国站上2022年北京冬奥会的赛场。一次就够了，足以让众军铭刻在心了。顾蕾和白若楠发现老师被绑架，立刻报警，却因为证据不足无法立案，只好自行寻人，在当地小混混坤哥和德华的帮助下，二人假扮成妓女混进了人贩基地，经过一番殊死搏斗却依然没有救出老师。棠微微从未正视过林燃的存在，她以为他们不过是一起长大的冤家姐弟，直到告白成真，一切甜蜜突如其来。林燃这个甜品过敏的邻家弟弟，成为了棠微微生命中最难以克服的难题……她无糖不欢，他对糖过敏，看热血小竹马如何设下诱爱陷阱，步步为营，拥人间小糖精姐姐入怀。The second type of data poisoning attack is to weaponize the user feedback system to attack legitimate users and content. Once attackers realize that you are using user feedback in some way for the purpose of punishment, they will try to use this fact for their own benefit.