/*16:9缩放*/

window.addEventListener('load', adaptation);

window.addEventListener('resize', adaptation);

​

function adaptation() {

  let el = document.getElementById('app')

  console.log({obj:el})

  const win_w = window.innerWidth;

  const win_h = window.innerHeight;

  const app_w = el.clientWidth;

  const app_h = el.clientHeight;

  const scale_w = win_w / app_w

  const sclae_h = win_h / app_h

  const left = -(app_w - win_w) / 2

  const top = -(app_h - win_h) / 2

  el.setAttribute('style', 'transform: scale(' + scale_w + ',' + sclae_h + ');left:' + left + 'px;top:' + top + 'px;');

}