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The purpose of this article is to share with you what the metadata in html is. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Understanding file metadata

Whenever we upload a file, the File object has metadata information, such as file name,size,last update time,type, and so on. This information is useful for further verification and special processing.

Const fileUploader = document.getElementById ('file-uploader'); / / listen to the change and read the metadata fileUploader.addEventListener (' change', (event) = > {/ / get the file list array const files = event.target.files; / / traverse and get the metadata for (const file of files) {const name = file.name; const type = file.type? File.type: 'NA'; const size = file.size; const lastModified = file.lastModified; console.log ({file, name, type, size, lastModified});}})

The following is the output of a single file upload:

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