2019独角兽企业重金招聘Python工程师标准>>> 
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <video id="video" controls width="270" autoplay> <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> <canvas id="myCanvas" width="270" height="135" style="border:1px solid #d3d3d3;"> Your browser does not support the HTML5 canvas tag. </canvas> </body> <script type="text/javascript"> var v = document.getElementById('video'); var c = document.getElementById('myCanvas'); var ctx = c.getContext('2d'); // 播放 v.addEventListener('play', function() { var i = window.setInterval(function() { ctx.drawImage(v, 0, 0, 270, 135); }, 20); // 每0.02秒画一张图片 }, false); // 暂停 v.addEventListener('pause', function() { window.clearInterval(i); // 暂停绘画 }, false); // 结束 v.addEventListener('ended', function() { clearInterval(i); }, false) </script> </html>