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//designSize为设计稿的尺寸(宽)

(function(doc, win, designSize) {


var docEl = document.documentElement,

devWidth = docEl.clientWidth > 1080 ? 1080 : docEl.clientWidth,

resizeEvt = ‘orientationchange’ in window ? ‘orientationchange’ : ‘onresize’, //判断横屏和窗口重置

recalc = function() {


var clientWidth = docEl.clientWidth;

if (!clientWidth) return;

docEl.style.fontSize = devWidth / (designSize / 100) + ‘px’;

};

if (!doc.addEventListener) return;

win.addEventListener(resizeEvt, recalc, false);

doc.addEventListener(‘DOMContentLoaded’, recalc, false);

})(document, window, 750);