(function (doc, win) {

    var docEl = doc.documentElement,

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

        // pieces = 750,

        recalc = function () {

            var clientWidth = docEl.clientWidth;

            if (!clientWidth) return;

            // docEl.style.fontSize = 100 * (clientWidth / pieces) + 'px';

            docEl.style.fontSize = clientWidth / 8 +'px';

            //pieces 是在gulp px2rem插件中设置的参数

        };

    if (!doc.addEventListener) return;

    win.addEventListener(resizeEvt, recalc, false);

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

})(document, window);

var baseSize = 100

function setRem () {

  var scale = document.documentElement.clientWidth / 750

  document.documentElement.style.fontSize = (baseSize * Math.min(scale, 3)) + 'px'

}

setRem()

window.onresize = function () {

  setRem()

}