将jquery代码转换为跨浏览器Ajax请求的原型以获取最新推文

var xhr = new XMLHttpRequest();

xhr.open('GET', 'https://api.example.com/tweets/latest', true);

xhr.setRequestHeader('Content-Type', 'application/json');

xhr.onload = function() {
  if (xhr.status >= 200 && xhr.status < 400) {
    var tweet = JSON.parse(xhr.responseText);
    console.log(tweet);
  } else {
    console.error('Error: ' + xhr.status);
  }
};

xhr.onerror = function() {
  console.error('Request failed');
};

xhr.send();

var xhr = new XMLHttpRequest();
xhr.open('GET', 'https://api.example.com/tweets/latest', true);
xhr.setRequestHeader('Content-Type', 'application/json');
xhr.onload = function() {
  if (xhr.status >= 200 && xhr.status < 400) {
    var tweet = JSON.parse(xhr.responseText);
    console.log(tweet);
  } else {
    console.error('Error: ' + xhr.status);
  }
};
xhr.onerror = function() {
  console.error('Request failed');
};
xhr.send();