rem自适应设置:设计稿宽度750px(iphone6/7/8)
设置:1rem = 100px,font-size: 0.16rem; //font-size: 16px;
(function (doc, win) {
var docEl = doc.documentElement,
resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize',
recalc = function () {
var clientWidth = docEl.clientWidth;
if (!clientWidth) return;
// fontSize / 100 = clientWidth / 750;
docEl.style.fontSize = (clientWidth / 7.50) + 'px';
};
if (!doc.addEventListener) return;
win.addEventListener(resizeEvt, recalc, false);
doc.addEventListener('DOMContentLoaded', recalc, false);
})(document, window);