个别用户电脑上传某些格式视频无法预览/播放

场景：某些电脑用户上传同一视频，却发现无法预览/播放该视频，如mov/f4v/vob/rm/rmvb...等格式

原因：使用同一个文件上传出现通过获取到的file对象type属性为""，系统中所安装的Microsoft Excel软件或注册表的原因，不常见的文件扩展名会返回空字符串，最好不要依靠这个type属性作为唯一的验证方案

方法：用file.type做匹配同时用file.name，把常见的type文件后缀name做个配对

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var fileTypeList = {   docx:"application/vnd.openxmlformats-officedocument.wordprocessingml.document",   doc:"application/msword",   pdf:"application/pdf",   rtf:"application/rtf",   xls:"application/vnd.ms-excel",   xlsx:"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",   ppt:"application/vnd.ms-powerpoint",   pptx:"application/vnd.openxmlformats-officedocument.presentationml.presentation",   rar:"application/x-rar-compressed",   swf:"application/x-shockwave-flash",   zip:"application/zip",   mid:"audio/midi",   midi:"audio/midi",   kar:"audio/midi",   mp3:"audio/mpeg",   ogg:"audio/ogg",   m4a:"audio/x-m4a",   ra:"audio/x-realaudio",   gif:"image/gif",   jpeg:"image/jpeg",   jpg:"image/jpeg",   png:"image/png",   tif:"image/tiff",   tiff:"image/tiff",   wbmp:"image/vnd.wap.wbmp",   ico:"image/x-icon",   jng:"image/x-jng",   bmp:"image/x-ms-bmp",   svg:"image/svg+xml",   svgz:"image/svg+xml",   webp:"image/webp",   css:"text/css",   html:"text/html",   htm:"text/html",   shtml:"text/html",   txt:"text/plain",   css:"text/css",   xml:"text/xml",   "3gpp":"video/3gpp",   "3gp":"video/3gpp",   mp4:"video/mp4",   mpeg:"video/mpeg",   mpg:"video/mpeg",   mov:"video/quicktime",   webm:"video/webm",   flv:"video/x-flv",   m4v:"video/x-m4v",   wmv:"video/x-ms-wmv",   avi:"video/x-msvideo", }

　　

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export function fileTypeFormat(file){   return file.type || fileTypeList[file.name.substring(file.name.lastIndexOf('.') + 1)] }

　　

相关文档解析见https://blog.csdn.net/wuhuama_/article/details/118699195