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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."Good afternoon, everyone. Thank you for attending today's company research report of Lujiazui Financial House. The company I want to share with you today is Boeing Company, which is the global aerospace industry leader ~ ~ ~ ~"嬴子夜颇为诧异地看了一眼尹旭，这是夫郎第一次对他这样说话。金牌骠叔骠婶和二女、小女一直住在公屋，大女与女婿欲迁回一起居住，屋村环境复杂，对女儿们出入构成威胁，于是骠叔决定举家搬迁。骠叔一家亲历香港楼价的疯狂境况，几经辛苦终觅得一层价格相宜的房屋。一家六口欢天喜地以为从此安居乐业，怎奈地产商已觊觎该楼，欲收购转卖给日本发展财团，谋取厚利。How to set the simulator parameters of each model, download the suitable simulator version, and the external U disk, please be patient and browse carefully from bottom to top. There is no shortcut. Each tool has been given a download address.2