移动端适配 rem 设置

    refresh();
    window.onresize = function(){
      setTimeout(function(){
        refresh();
      },10)
    };
    function refresh() {
      let deviceWidth = document.documentElement.clientWidth;
      if (deviceWidth > 1200) {
        document.documentElement.style.fontSize = 1200 / 12 + "px";
      } else {
        document.documentElement.style.fontSize = deviceWidth / 7.5 + "px";
        console.log(deviceWidth / 7.5+ "px");
      }
    }

移动端适配 rem 设置

原文：https://www.cnblogs.com/shouzi/p/9565897.html