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HTML 参考手册
HTML 音频/视频 DOM volume 属性
tryhtml5_av_prop_volume
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<!DOCTYPE html> <html> <body> <button onclick="getVolume()" type="button">What is the volume?</button> <button onclick="setHalfVolume()" type="button">Set volume to 0.2</button> <button onclick="setFullVolume()" type="button">Set volume to 1.0</button><br> <video id="myVideo" width="320" height="176" controls> <source src="/demo/video/mov_bbb.mp4" type="video/mp4"> <source src="/demo/video/mov_bbb.ogg" type="video/ogg"> Your browser does not support HTML5 video. </video> <script> let vid = document.getElementById("myVideo"); function getVolume() { alert(vid.volume); } function setHalfVolume() { vid.volume = 0.2; } function setFullVolume() { vid.volume = 1.0; } </script> </body> </html>