根据设备dpr设置fontSize

翻了半天简书，试了不少这种代码，结果还是找到自己以前的有效果，东西果然还是自己的好用 (-_- !

<script type="text/javascript">

;(function(doc, win) {

var docEle = doc.documentElement,

dpr = Math.min(win.devicePixelRatio, 3),

scale = 1 / dpr,

resizeEvent = 'orientationchange' in window ? 'orientationchange' : 'resize';

var metaEle = doc.createElement('meta');

metaEle.name = 'viewport';

metaEle.content = 'initial-scale=' + 1 + ',maximum-scale=' + scale;

docEle.firstElementChild.appendChild(metaEle);

var recalCulate = function() {

var width = docEle.clientWidth;

docEle.style.fontSize = 10 * (width / 375) + 'px';

};

recalCulate();

if (!doc.addEventListener) return;

win.addEventListener(resizeEvent, recalCulate, false);

})(document, window);

</script>