在IE中，“文件”->“另存为”和document.execCommand（'SaveAs'）有什么区别？

Question

In IE, what's the difference between File->Save As (pic1) and document.execCommand('SaveAs') (pic2)?

The popup window seems to be the same with just some minor differences.

pic1 ( File->Save As ):

pic2 ( document.execCommand('SaveAs') ):

(IE version 10)

Answer 1

With File -> Save As you're saving the entirety of the web page that's been loaded (including any assets (CSS files, images, etc.)). This is why the save as type here is set to "Webpage, complete".

With document.execCommand('SaveAs') you're saving the HTML document specifically without any of the assets, which is why the save as type in this case is "HTML File".