Js 之移动端自适应rem.js

一、代码

1rem = 100px

(function (doc, win) {
        var docEl = doc.documentElement,
            resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize',
            recalc = function () {
                var clientWidth = docEl.clientWidth;
                if (!clientWidth) return;
                // 这里的750 取决于设计稿的宽度
                if (clientWidth >= 750) {
                    docEl.style.fontSize = '100px';
                } else {
                    docEl.style.fontSize = 100 * (clientWidth / 750) + 'px';
                }
            };
        if (!doc.addEventListener) return;
        win.addEventListener(resizeEvt, recalc, false);
        doc.addEventListener('DOMContentLoaded', recalc, false);
})(document, window);