W3School TIY Editor
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<!DOCTYPE html> <html> <body> <button onclick="enablePreload()" type="button">启用预加载</button> <button onclick="disablePreload()" type="button">禁用预加载</button> <button onclick="checkPreload()" type="button">检查预加载状态</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 enablePreload() { myVid.preload="auto"; } function disablePreload() { myVid.preload="none"; } function checkPreload() { alert(myVid.preload); } </script> </body> </html>