I’ve put the bottom-of-the-frame interrupt first here. This is mainly out of laziness—since this is the interrupt that restores the display for the next frame, putting it first means that it will also end up being the screen initialization code.
ISS astronauts begin journey back to Earth in Nasa’s first ever medical evacuation
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1.解析 html 页面，生成一个包含节点位置信息，样式，层级，内容等信息的 DOM 树。
敦促各方停止军事行动 防止战火进一步蔓延