在线音频测试链接
https://www.cambridgeenglish.org/images/153149-movers-sample-listening-test-vol2.mp3
https://www.cambridgeenglish.org/images/506891-a2-key-for-schools-listening-sample-test.mp3
https://www.w3school.com.cn/i/horse.ogg
https://www.runoob.com/try/demo_source/horse.mp3
在线视频测试链接：
http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4
http://vjs.zencdn.net/v/oceans.mp4
https://media.w3.org/2010/05/sintel/trailer.mp4
http://mirror.aarnet.edu.au/pub/TED-talks/911Mothers_2010W-480p.mp4
http://vfx.mtime.cn/Video/2019/03/19/mp4/190319212559089721.mp4
http://vfx.mtime.cn/Video/2019/03/18/mp4/190318231014076505.mp4
在线图片测试链接：
http://static.runoob.com/images/demo/demo2.jpg
http://image.nbd.com.cn/uploads/articles/images/673466/500352700_banner.jpg
http://lorempixel.com/200/200/people/1
https://images.unsplash.com/photo-1586097384184-79ba1cec7881?ixlib=rb-1.2.1&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=400&fit=max&ixid=eyJhcHBfaWQiOjE0NTg5fQ
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原文链接：https://blog.csdn.net/sinat_36359516/article/details/119642970
