h5 rem js自动适配

(function (doc, win) {

var docEl = doc.documentElement,

resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize',

recalc = function () {

var clientWidth = docEl.clientWidth;

if (!clientWidth) return;

 

docEl.style.fontSize = clientWidth<750? (clientWidth / 320)*100 + 'px' : '100px';

};

// Abort if browser does not support addEventListener

if (!doc.addEventListener) return;

win.addEventListener(resizeEvt, recalc, false);

doc.addEventListener('DOMContentLoaded', recalc, false);

})(document, window);

 

 

将此代放置 title 下方，使其优先加载