javascript-base64字符串转成ArrayBuffer类型

共计 339 个字符，预计需要花费 1 分钟才能阅读完成。

function urlBase64ToUint8Array(base64String) {const padding = '='.repeat((4 - base64String.length % 4) % 4);
  const base64 = (base64String + padding)
    .replace(/\-/g, '+')
    .replace(/_/g, '/');

  const rawData = window.atob(base64);
  const outputArray = new Uint8Array(rawData.length);

  for (let i = 0; i < rawData.length; ++i) {outputArray[i] = rawData.charCodeAt(i);
  }
  return outputArray;
}