Javascript -在in 2中将图像数据url更改/转换为文件url

Question

是否可以更改或转换图像的数据url为文件url？

例如，我从链接中获得了图像，但数据非常长，例如

数据:image/x-icon；base64，AAABAAEAEBAAAAEAIABoBAAAFgAAACgAAAAQAAAAIAAAAAEAIAAAAAAAQAQAABMLAAATCwAAAAAAAAAAAABsiqb/bIqm/2yKpv9siqb/bIqm/2yKpv9siqb/iKC3/2yKpv9siqb/bIqm/2yKpv9siqb/bIqm/2yKpv9siqb/bIqm/2yKpv9siqb/bIqm/2yKpv9siqb/2uLp///////R2uP/dZGs/2yKpv9siqb/bIqm/2yKpv9siqb/bIqm/2yKpv9siqb/bIqm/2yKpv9siqb/bIqm/////////////////+3w9P+IoLf/bIqm/2yKpv9siqb/bIqm/2yKpv9siqb/bIqm/2yKpv9siqb/bIqm/2yKpv///////////+3w9P+tvc3/dZGs/2yKpv9siqb/bIqm/2yKpv9siqb/TZbB/02Wwf9NlsH/TZbB/02Wwf9NlsH////////////0+Pv/erDR/02Wwf9NlsH/TZbB/02Wwf9NlsH/TZbB/02Wwf9NlsH/TZbB/02Wwf9NlsH/TZbB//////////////////////96sNH/TZbB/02Wwf9NlsH/TZbB/02Wwf9NlsH/TZbB/02Wwf9NlsH/TZbB/02Wwf////////////////+Ft9T/TZbB/02Wwf9NlsH/TZbB/02Wwf9NlsH/E4zV/xOM1f8TjNX/E4zV/yKT2P/T6ff/////////////////4fH6/z+i3f8TjNX/E4zV/xOM1f8TjNX/E4zV/xOM1f8TjNX/E4zV/xOM1f+m1O/////////////////////////////w+Pz/IpPY/xOM1f8TjNX/E4zV/xOM1f8TjNX/E4zV/xOM1f8TjNX////////////T6ff/Tqng/6bU7////////////3u/5/8TjNX/E4zV/xOM1f8TjNX/AIv//wCL//8Ai///AIv/////////////gMX//wCL//8gmv////////////+Axf//AIv//wCL//8Ai///AIv//wCL//8Ai///AIv//wCL///v+P///////+/4//+Axf//z+n/////////////YLf//wCL//8Ai///AIv//wCL//8Ai///AIv//wCL//8Ai///gMX/////////////////////////////z+n//wCL//8Ai///AIv//wCL//8Ai///AHr//wB6//8Aev//AHr//wB6//+Avf//7/f/////////////v97//xCC//8Aev//AHr//wB6//8Aev//AHr//wB6//8Aev//AHr//wB6//8Aev//AHr//wB6//8Aev//AHr//wB6//8Aev//AHr//wB6//8Aev//AHr//wB6//8Aev//AHr//wB6//8Aev//AHr//wB6//8Aev//AHr//wB6//8Aev//AHr//wB6//8Aev//AHr//wB6//8Aev//AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=

那么如何将其转换为

file:///storage/emulated/..../image1.jpg

Answer 1

您可以将有效data URI的MIME类型替换为"application/octet-stream"，在<a>元素的.href处设置值，将download属性值设置为"image1.validExtension"，将元素追加到document.body，在a元素上调用.click()

var stream = validDataURI.replace(/[^:][\w/-]+(?=;|,)/, "application/octet-stream");
var a = document.createElement("a");
a.href = stream;
a.download = "image1.validExtension";
document.body.appendChild(a);
a.click();