About the IE support.

[luckerxia]

I use IE 10, the image cann't show, base64 code isn't generation.

--NEXT.ITEM-BOUNDARY
Content-Location: http://****/images/ECharts.png
Content-Type: data:
Content-Transfer-Encoding: data:

--NEXT.ITEM-BOUNDARY--

[breezing]

Hi

That's probably because following codes, as width and height return 0 under IE. I have added width and height attribute to img element, but it doesn't work...
// Calculate dimensions of output image
var w = Math.min(img[i].width, options.maxWidth);
var h = img[i].height * (w / img[i].width);

[Divyeshkotadia]

@breezing you are correct.
Just by adding width and height attributes in image tag and it created canvas object with data. Hope this helps!!!