In this loop, “req.files.upload.length” returns file count when 0, or more than one files are uploaded, however when one file is uploaded “req.files.upload.length” returns file size. Why?In this loop, “req.files.upload.length” returns
阅读背景：
req.files.upload.length返回文件计数为零，或上传多个文件，当一个文件上传时，它返回文件大小
来源：互联网
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