javascript中的Curl -u请求

var xhr = new XMLHttpRequest();
xhr.open("GET", "https://example.com/api/resource", true);
xhr.setRequestHeader("Authorization", "Basic " + btoa("username:password"));
xhr.onreadystatechange = function() {
  if (xhr.readyState === 4 && xhr.status === 200) {
    var response = JSON.parse(xhr.responseText);
    // 处理响应
  }
};
xhr.send();

fetch("https://example.com/api/resource", {
  method: "GET",
  headers: {
    "Authorization": "Basic " + btoa("username:password")
  }
})
.then(response => response.json())
.then(data => {
  // 处理响应
})
.catch(error => {
  // 处理错误
});