!(function (doc, win) { var docEle = doc.documentElement, evt = "onorientationchange" in window ? "orientationchange" : "resize", fn = function () { var width = docEle.clientWidth; // width && (docEle.style.fontSize = 20 * (width / 375) + "px"); width && (docEle.style.fontSize = 10*width / 75 + "px"); }; win.addEventListener(evt, fn, false); doc.addEventListener("DOMContentLoaded", fn, false); }(document, window));