在http://www.w3school.com.cn/html5/html_5_video.asp的源码里摘出来的。
function checkVideo() { if(!!document.createElement('video').canPlayType) { var vidTest=document.createElement("video"); oggTest=vidTest.canPlayType('video/ogg; codecs="theora, vorbis"'); if (!oggTest) { h264Test=vidTest.canPlayType('video/mp4; codecs="avc1.42E01E, mp4a.40.2"'); if (!h264Test) { document.getElementById("checkVideoResult").innerHTML="Sorry. No video support." } else { if (h264Test=="probably") { document.getElementById("checkVideoResult").innerHTML="Yes! Full support!"; } else { document.getElementById("checkVideoResult").innerHTML="Well. Some support."; } } } else { if (oggTest=="probably") { document.getElementById("checkVideoResult").innerHTML="Yes! Full support!"; } else { document.getElementById("checkVideoResult").innerHTML="Well. Some support."; } } } else { document.getElementById("checkVideoResult").innerHTML="Sorry. No video support." } }