baiduSpeedTest.js

let arr = `112.80.248.52
27.221.40.46
119.75.219.40
111.13.12.44
111.13.12.22
111.13.100.27
117.185.16.83
117.185.16.84
117.185.16.13`.split('\n');
arr = arr.map(url=>'http://'+url);
const connectSpeed = async(...urls) => {
  if (urls.length === 1 && urls[0].push) urls = urls[0];
  let result = {};
  const initTime = performance.now();
  await Promise.all(urls.map(url => fetch(url).then(res => res.text()).then(() => (result[url] = performance.now() - initTime)).catch(e => (result[url] = e))));
  let speeds = [];
  for (let i in result) speeds.push([i, result[i]]);
  speeds.sort((a, b) => a[1] - b[1]);
  return speeds.map(e=>e[0].replace(/^http:\/\//,''));
};
connectSpeed(arr).then(speeds=>console.log(speeds[0]))

connectSpeed.js

const connectSpeed = async(...urls) => {
	if (urls.length === 1 && urls[0].push) urls = urls[0];
	let result = {};
	const initTime = performance.now();
	await Promise.all(urls.map(url => fetch(url).then(res => res.text()).then(() => (result[url] = performance.now() - initTime)).catch(e => (result[url] = e))));
	return result;
};