W3Schools 在线编辑工具（TIY） V3.0
编辑的代码:
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<!DOCTYPE html> <html> <body> <button onclick="getVolume()" type="button">音量是多少？</button> <button onclick="setHalfVolume()" type="button">把音量设置为 0.2</button> <button onclick="setFullVolume()" type="button">把音量设置为 1.0</button> <br /> <br /> <video id="video1" controls="controls"> <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 getVolume() { alert(myVid.volume); } function setHalfVolume() { myVid.volume=0.2; } function setFullVolume() { myVid.volume=1.0; } </script> </body> </html>