用于HTTP基本身份验证的纯JavaScript代码？

function httpBasicAuth(username, password) {
  const credentials = username + ':' + password;
  const base64Credentials = btoa(credentials);
  const headers = {
    'Authorization': 'Basic ' + base64Credentials
  };
  return headers;
}

function httpBasicAuth(username, password) {
  const credentials = username + ':' + password;
  const base64Credentials = Buffer.from(credentials).toString('base64');
  const headers = {
    'Authorization': 'Basic ' + base64Credentials
  };
  return headers;
}