h5页面px和rem单位的自动换算

转载自： https://blog.csdn.net/lianwenxiu/article/details/87897453

放到index.html下
750 //设计图宽度

(function(doc, win) { 
                var docE1 = doc.documentElement,
                resizeEvt = 'orientationchange' in window ? 'orientationchange': 'resize',
                recalc = function() { 
                    var clientWidth = docE1.clientWidth;
                    if (!clientWidth) return;
                    docE1.style.fontSize = 100 * (clientWidth / 750) + 'px';
                };                
                if (!doc.addEventListener) return;
                win.addEventListener(resizeEvt, recalc, false);
                doc.addEventListener('DOMContentLoaded', recalc, false);
        })(document, window);