静态资源
在线视频测试链接：
mp4-1: http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4
mp4-2: http://vjs.zencdn.net/v/oceans.mp4
mp4-3: https://media.w3.org/2010/05/sintel/trailer.mp4
mp4-4: http://mirror.aarnet.edu.au/pub/TED-talks/911Mothers_2010W-480p.mp4
在线其它格式视频资源下载，MP4, flv, mkv, 3gp 等
在线图片测试链接(http or https 都行)：
jpg1: //static.runoob.com/images/demo/demo2.jpg
jpg2: //image.nbd.com.cn/uploads/articles/images/673466/500352700_banner.jpg
no suffix pic https://gd-hbimg.huaban.com/c98459fc2d3ca661f7de07851ae6536ce7636a7aa10e-rpEP4P_fw1200webp
横版图片
https://images.pexels.com/photos/2378278/pexels-photo-2378278.jpeg?auto=compress&cs=tinysrgb&w=1200
[https://images.pexels.com/photos/206359/pexels-photo-206359.jpeg?auto=compress&cs=tinysrgb&w=1200](https://images.pexels.com/photos/206359/pexels-photo-206359.jpeg?auto=compress&cs=tinysrgb&w=1200)
[https://images.pexels.com/photos/2174974/pexels-photo-2174974.jpeg?auto=compress&cs=tinysrgb&w=1200](https://images.pexels.com/photos/2174974/pexels-photo-2174974.jpeg?auto=compress&cs=tinysrgb&w=1200)