Javascript note

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const arrayBufferToBase64Img = (buffer) => {
  const str = String.fromCharCode(...new Uint8Array(buffer));
  return `data:image/jpeg;base64,${window.btoa(str)}`;
}

得到一个ArrayBuffer —-> 转成类型化数组以正常读取 —> 转成普通字符串 —> 转成base64字符串