now the demand is that 4G files need to be uploaded and uploaded in parts; on the other hand, when the file needs to be downloaded, it needs to be downloaded in segments, and the url, front end of many files need to realize url to get the file stitched and packaged into a complete file.
1. For multipart upload, use the slice function of the blob object, fragment, and then submit the form, and merge
2 at the back end. If you download in segments, you don't know how to implement it. If the file is too large, you can only use the download tool
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