// Only using native browser features (no jQuery).
// Uses `fetch`, `DOMParser` and `querySelectorAll`.

const getTitle = (url) => {  
  return fetch(`${url}`)
    .then((response) => response.text())
    .then((html) => {
      const doc = new DOMParser().parseFromString(html, "text/html");
      const title = doc.querySelectorAll('title')[0];
      return title.innerText;
    });
};


var urls = [
  'https://www.h404bi.com/blog/2019/07/better-lazyload-implementation-with-responsive-images',
  'https://baidu.com'
]

// This one keeps the order the same as the URL list.
Promise.all(
  urls.map((url) => getTitle(url))
).then((titles) => {
  console.log(titles);
});