在JavaScript中将字符串转换为base64。不推荐使用btoa和atob

const encoder = new TextEncoder();
const data = encoder.encode("Hello, World!");
const base64 = btoa(String.fromCharCode.apply(null, data));
console.log(base64);

function stringToBase64(str) {
  let base64 = "";
  for (let i = 0; i < str.length; i++) {
    const charCode = str.charCodeAt(i);
    const binary = String.fromCharCode(charCode);
    base64 += btoa(binary);
  }
  return base64;
}

const base64 = stringToBase64("Hello, World!");
console.log(base64);