字体大小的适配

 //重新设置根元素的fontSize
      function resetRootSize(val) {
        let percentage = [0.8, 1, 1.2];
        let fontSizeVal = parseInt(
          (2 * Math.min(document.documentElement.clientWidth, 750)) / 7.5
        );
        document.documentElement.style.fontSize =
          percentage[val] * fontSizeVal + "px";
      }

      let pageFontSize = JSON.parse(
        localStorage.getItem("pageFontSize") || '{"value":1}'
      );
      resetRootSize(Number(pageFontSize?.value));