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<!DOCTYPE html> <html> <body> <button onclick="getNWState()" type="button">获得网络状态</button> <br /> <br /> <video id="video1" controls="controls" autoplay="autoplay"> <source src="/example/html5/mov_bbb.mp4" type="video/mp4"> <source src="/example/html5/mov_bbb.ogg" type="video/ogg"> Your browser does not support HTML5 video. </video> <script> myVid=document.getElementById("video1"); function getNWState() { alert(myVid.networkState); } </script> </body> </html>