<canvas id="canvas" width="480" height="320"></canvas> 
      <button id="download">Download Pdf</button>

“

html2canvas($("#canvas"),{
            onrendered: function(canvas) {         
                var imgData = canvas.toDataURL(
                    'image/png');              
                var doc = new jsPDF('p','mm');
                doc.addImage(imgData,'PNG',10,10);
                doc.save('sample-file.pdf');
            }
        });

jsfiddle：http://jsfiddle.net/p4s5k59s/1222/

在Chrome 38,IE11和Firefox 34中测试.对于Safari,您可能需要将图像格式更改为JPEG fron PNG.