mobile字体大小

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(function (win, doc) {
 if (!win.addEventListener) return;
 let html = document.documentElement;
 function setFont() {
  let html = document.documentElement;
  let k = 750;
  html.style.fontSize = html.clientWidth / k * 100 + "px";
 }
 setFont();
 setTimeout(function () {
  setFont();
 }, 300);
 doc.addEventListener('DOMContentLoaded', setFont, false);
 win.addEventListener('resize', setFont, false);
 win.addEventListener('load', setFont, false);
})(window, document);