<iframe src='https://player.bilibili.com/player.html?bvid=1HcmgBJE9G&quality=16' border='0' scrolling='no' framespacing='0' allowfullscreen='true' style='max-width: 100%' width='500' height='375' frameborder='no'></iframe>
可以自由设定宽、高，其中的1HcmgBJE9G是视频ID，而下面这个是按照你设置的宽高比例自动设定大小，默认是16:9
<div style="position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden;"><iframe src="https://player.bilibili.com/player.html?bvid=视频ID" style="position: absolute; top: 0; left: 0; width: 100%; height: 100%; border: 0;" frameborder="0" allowfullscreen></iframe></div>
