要使其在Firefox中运行，只需将新元素插入DOM(apendChild等).

To make it work in Firefox, just insert the new element into the DOM (apendChild, etc).

我认为这不适用于Safari:

I don't think this will work in Safari:

不支持
• <a download="">(正确)，AFIAK.例如. a.download =不会做您想要的.您仍然可以使用setAttribute，但是Safari仍然会忽略它.
• 我认为Safari确实不支持下载blob:-URI.

• <a download=""> isn't (properly) supported yet, AFAIK. E.g. a.download = will not do what you want. You could still use setAttribute but Safari will still ignore it.
• I don't think Safari does support downloading of blob:-URIs, anyway.