前端字体随屏幕大小自适应

(function (doc, win) {
var docEl = doc.documentElement,
resizeEvt = ‘orientationchange’ in window ? ‘orientationchange’ : ‘resize’,
recalc = function () {
var clientWidth = docEl.clientWidth;
if (!clientWidth) return;
if (clientWidth >= 1920) {
docEl.style.fontSize = ‘100px’; //1rem = 100px
} else {
docEl.style.fontSize = 100 * (clientWidth / 1920) + ‘px’;
}
};
if (!doc.addEventListener) return;
win.addEventListener(resizeEvt, recalc, false);
doc.addEventListener(‘DOMContentLoaded’, recalc, false);
})(document, window);