var pixclPatio = 1 / window.devicePixelRatio;
document.write(‘<meta name="viewport" content="width=device-width,initial-scale=‘ + pixclPatio + ",minimum-scale=" + pixclPatio + ",maximum-scale=" + pixclPatio + ‘" />‘);
setSize();
window.addEventListener("resize", setSize, false);
window.addEventListener("orientationchange", setSize, false);
function setSize() {
  var html = document.getElementsByTagName("html")[0];
  var pageWidth = html.getBoundingClientRect().width;
  html.style.fontSize = pageWidth > 1536 ? "54px" : pageWidth / 10 + "px"
};

公共设置