利用JavaScript生成GIF图片：gif.js

gif.js是一个功能强大，运行在浏览器中的JavaScript GIF 编码器。

var gif = new GIF({    workers: 2,    quality: 10  });    // add a image element  gif.addFrame(imageElement);    // or a canvas element  gif.addFrame(canvasElement, {delay: 200});    // or copy the pixels from a canvas context  gif.addFrame(ctx, {copy: true});    gif.on('finished', function(blob) {    window.open(URL.createObjectURL(blob));  });    gif.render();

项目主页：http://www.open-open.com/lib/view/home/1369726496909