Firefox在“保存类型”-“另存为”对话框中错误的文件类型

Question

I'm trying with FileSaver.js ( https://github.com/eligrey/FileSaver.js/ )

When I save an image of type jpg, the save as dialog displaying in Firefox gives incorrect value at Save as type dropdown (It says "PNG Image ( .jpg), but what I expect is JPEG Image ( .jpg)).

Could anyone tell me how to fix this?

Answer 1

Finally, I found out the reason for this issue.

I use canvas-toblob javascript library to convert a canvas to blob. But Firefox has internal implementation for toblob method, so the same method in canvas-toblob.js is never called.

I modify canvas-toblob.js so that Firefox will use the method in this library. This solved my issue

if (HTMLCanvasElement) { canvas_proto.toBlob = function(callback, type /*, ...args*/) { if (!type) { type = "image/png"; } if (this.msToBlob && /^\\s*image\\/png\\s*(?:$|;)/i.test(type)) { callback(this.msToBlob()); return; }

Answer 2

您需要为type参数指定image / jpeg。