Convert Base64 to image file with javascript

问题

Does anyone know of any simple javascript that I can use to turn a base64 string into an image (jpg format preferably), so that I can save the image to a file? This is for a signature pad application. I can get the signature into a base64 format, but need to save the signature as an image file to use for embedding into a Crystal Report.

回答1:

I have tried this method in a JSP page to print the image from a base64 string, I guess this should hold good for javascript too. Do not have sample data for now to verify, but here's how I would try it.

var oImg=document.createElement("img");
var baseString = null;    //the base64 string you have
var imsc = 'data:image/jpg;base64, '+baseString;
oImg.setAttribute('src', imsc);
document.body.appendChild(oImg);

来源：https://stackoverflow.com/questions/26631629/convert-base64-to-image-file-with-javascript