系统字体放大导致rem布局错乱,解决方案,已通过测试

如果你用rem没遇到过坑,那只能说明你 too young too simple;

(function (doc, win) {

    var resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize',

        recalc = function () {

            var cW = document.documentElement.clientWidth,

                iW = window.innerWidth;

            var w = Math.max(cW, iW);

                w = w > 750 ? 750 : w;

            var fz = ~~(w / 7.5);

            document.getElementsByTagName("html")[0].style.cssText = 'font-size: ' + fz + "px";

            function setHtmlSize() {

                var realfz = ~~(+window.getComputedStyle(document.getElementsByTagName("html")[0]).fontSize.replace('px', '') * 10000) / 10000;

                if (fz !== realfz) {

                    document.getElementsByTagName("html")[0].style.cssText = 'font-size: ' + fz * (fz / realfz) + "px";

                }

            }

            setHtmlSize();

        };

    if (!doc.addEventListener) return;

    win.addEventListener(resizeEvt, recalc, false);

    doc.addEventListener('DOMContentLoaded', recalc, false);

})(document, window);