JavaScript Blobオブジェクトでファイルを作成してダウンロードしてみる
A Blob object represents a file-like object of immutable, raw data. Blobs represent data that isn't necessarily in a JavaScript-native format. The File interface is based on Blob, inheriting blob functionality and expanding it to support files on the user's system. 出典: Blob | MDN JavaScriptで扱え…
