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【JavaScript】画像のファイルタイプをバイナリレベルで判別する方法

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こちらを参考
すごく勉強になりました。

概要

  1. readAsArrayBufferでバイナリに変更
  2. Uint8Arrayを使って変換 new Uint8Array(binary)
  3. 初めの10個分を読む
  4. 1文字ずつ16進数列に変換 toString(16)
  5. 変換した文字列がどの画像形式か判別する
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