如何使用javascript检查文件类型。 [英] How to check the file type using javascript.

问题描述

我要求只上传.PDF文件，它返回application / pdf mime type.But如果我只是将.txt文件的文件扩展名更改为.PDF文件然后它返回mime类型作为application / pdf并上传有没有办法安全地检查它，以便一些用户不只是上传不必要的文件。



我尝试过： < br $>


我检查了扩展名并检查了PDF文件的MIME类型。

I have a requirement to upload only.PDF file, it returns application/pdf mime type.But if I just change the file extension of .txt file to .PDF file then it returns mime type as application/pdf and getting uploaded.Is there any way to check it safely so that some user doesn't just upload unnecessary file.

What I have tried:

I checked the extension and also checked the MIME type of PDF file.

推荐答案

验证pdf文件javascript - Google搜索 [ ^ ]

我能理解，我们要么

1）检查文件扩展名或

2）检查MIME类型



我可以帮忙解决这个问题文章虽然检查文件签名。请试试。 文件签名 [ ^ ]

I could understand that, either we will
1) check the file extension or
2) check the MIME type

I could help with this article though to check the file signatures. Please try. File Signatures[^]

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