如何在adapter-impl js文件中发送用户名、密码和身份验证类型为basic的基本授权

var xhr = new XMLHttpRequest();
xhr.open('GET', 'https://api.example.com/endpoint', true);

var username = 'your_username';
var password = 'your_password';
var authString = username + ':' + password;
var encodedAuthString = btoa(authString);

xhr.setRequestHeader('Authorization', 'Basic ' + encodedAuthString);

xhr.onreadystatechange = function() {
  if (xhr.readyState === XMLHttpRequest.DONE) {
    if (xhr.status === 200) {
      // 请求成功
      var response = xhr.responseText;
      console.log(response);
    } else {
      // 请求失败
      console.error('请求失败：' + xhr.status);
    }
  }
};

xhr.send();