一种计算移动端布局尺寸基准的方法

setBaseFontSize.js

(function(doc, win) {

    var docEle = doc.documentElement,
        evt = "onorientationchange" in window ? "orientationchange" : "resize",
        setBaseFontSize = function() {
            var width = docEle.clientWidth;
            // 基于320px宽的设计稿，对应100px的基准字体
            width && ( docEle.style.fontSize = 100 / 320 * width + "px" );
        };

    win.addEventListener(evt, setBaseFontSize, false);
    doc.addEventListener("DOMContentLoaded", setBaseFontSize, false);

}(document, window));