本文实例讲述了js+HTML5实现视频截图的方法。分享给大家供大家参考。具体如下：

1. HTML部分：

<video id="video" controls="controls"> <source src=".mp4" /></video><button id="capture">Capture</button><div id="output"></div>

2. 点击按钮时触发如下代码：

(function() { "use strict"; var video, $output; var scale = 0.25; var initialize = function() { $output = $("#output"); video = $("#video").get(0); $("#capture").click(captureImage); }; var captureImage = function() { var canvas = document.createElement("canvas"); canvas.width = video.videoWidth * scale; canvas.height = video.videoHeight * scale; canvas.getContext('2d') .drawImage(video, 0, 0, canvas.width, canvas.height); var img = document.createElement("img"); img.src = canvas.toDataURL(); $output.prepend(img); }; $(initialize); }());

希望本文所述对大家的javascript程序设计有所帮助。