})(document, window);

拜讀大神的作品

移動(dòng)端解決方案

((doc, win) => {  const docEl = doc.documentElement,    resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize',    recalc = () => {      let clientWidth = docEl.clientWidth;      if (!clientWidth) return;      docEl.style.fontSize = 20 * (clientWidth / 320) + 'px';      console.log( docEl.style.fontSize)    };  if (!doc.addEventListener) return;  win.addEventListener(resizeEvt, recalc, false);  doc.addEventListener('DOMContentLoaded', recalc, false);  //當(dāng)dom加載完成時(shí)，或者 屏幕垂直、水平方向有改變進(jìn)行html的根元素計(jì)算})(document, window);if ('addEventListener' in document) {  document.addEventListener('DOMContentLoaded', function() {    FastClick.attach(document.body);  }, false);}