大屏最外层的字体大小fontSize设置

//设计稿是1920 * 1080，以1920对应是基数是100
function largeScreen(){
  let baseNumber = 100;//基数
  let clientWidth = document.documentElement.clientWidth;
  clientWidth = Math.max(clientWidth,1800);//限制最小宽度1800像素

  let ratio = clientWidth / 1920;
  let fontSize = Math.ceil(baseNumber * ratio);
  document.documentElement.style.fontSize = `${fontSize}px`;
}

largeScreen();
window.addEventListener('resize',largeScreen);