!(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));