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HTML 参考手册
HTML 音频/视频 DOM progress 事件
tryhtml5_av_event_progress_el
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<!DOCTYPE html> <html> <body> <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"); vid.addEventListener("progress", function() { alert("Downloading video"); }); </script> </body> </html>