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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.Reprint Statement: If there is no special explanation on this site, all articles are original. Please indicate the source for reprinting: Children's Programming Network, thank you! ^ ^乱世谍影、疑雾重重、步步杀机；孤胆英雄、潜入敌后、虎口拔牙。谨以以剧纪念抗日战争胜利而牺牲的敌后的无名英雄们！满州，日本关东军情报部内先后潜入几批人，一时枪声大作，硝烟过后，日军发现藏于密室的机密档案已消失……而此时装机密文件的黑箱子却在几个黑衣人手中爆炸，日本特务机关头子藤田大佐面带微笑地布置追捕行动，经过此次周密的诱饵行动，几利将各方面驻满州的地下组织/间谍机关一网打尽，为军部即将执行的计划铺平了道路。原来日本军部准备在满州策划一个极为机密、重要的工程《松北工程》，并派出松桥正雄博士前往哈尔泊考察并制订此项工程各国的情报机关、国民党的特务机关都对此虎视眈眈，我地下党组织派李炎当任满州省委行动队队长，主持满州的工作，由于松桥的好色，潜伏在俄国妓女家里的我地下党特工孙嫂侦察到他的行踪，可就在行动队要对松桥下手时，发现他已经死在列车上……松桥的死震惊日本关东军军部，责令藤田尽快破案，在搜捕过程中，李炎意外地见到青年时期的恋人，可她现在的身份却是日军情报部的菊地美代少佐……一个杀人狂商店的店员发现了她自己家族的黑暗历史，当她被要求出售尚未破案的纪念品时。Define a factory interface. Q: How will it be realized? A: Declare a factory abstract classSteve's Super Memory//018