Open david2tdw opened 4 years ago
<!DOCTYPE html> <html> <body> <p>要使用的视频:</p> <video id="video1" controls width="270" autoplay loop muted style="visibility:hidden;height:0"> <source src="http://www.w3school.com.cn/example/html5/mov_bbb.mp4" type='video/mp4'> <source src="http://www.w3school.com.cn/example/html5/mov_bbb.ogg" type='video/ogg'> <source src="http://www.w3school.com.cn/example/html5/mov_bbb.webm" type='video/webm'> </video> <p>画布(每 20 毫秒,代码就会绘制视频的当前帧):</p> <canvas id="myCanvas" width="270" height="135" style="border:1px solid #d3d3d3;"> Your browser does not support the HTML5 canvas tag. </canvas> <script> var v = document.getElementById("video1"); var c = document.getElementById("myCanvas"); ctx = c.getContext('2d'); var i = null window.setInterval(function () { ctx.drawImage(v, 0, 0, 270, 135) }, 20); // v.addEventListener('play', function () { // i = window.setInterval(function () { // ctx.drawImage(v, 0, 0, 270, 135) // }, 20); // }, false); v.addEventListener('pause', function () { window.clearInterval(i); }, false); v.addEventListener('ended', function () { clearInterval(i); }, false); </script> </body> </html>