移动端适配1px问题

(function(document) {

    var dcl = document.documentElement, wh;

    var scale = 1/window.devicePixelRatio;

    document.querySelector('meta[name="viewport"]').setAttribute('content','initial-scale=' + scale + ', maximum-scale=' + scale + ', minimum-scale=' + scale + ', user-scalable=no');

    function setRootRem() {

        wh = dcl.clientHeight;

        dcl.style.fontSize = 100 * (wh / 1334) + 'px';

    }

    setRootRem();

    document.addEventListener('DOMContentLoaded', setRootRem, false);

    window.addEventListener('resize', setRootRem, false);

})(document);

但是这样会导致在iphone6时输出document.documentElement.clientWidth为750.与传统获取为375不符合。