rem手机端适配

<script>
    document.documentElement.style.fontSize=document.documentElement.clientWidth*100/750+"px";
    window.addEventListener("resize",function(){
        document.documentElement.style.fontSize=document.documentElement.clientWidth*100/750+"px";
    },false)
</script>


<script>
    //因绝对定位+margin百分比定位在UC中有BUG，翻屏页面建议使用rem单位
    (function (doc, win) {
        var docEl = doc.documentElement,
                resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize',
                recalc = function () {
                    var clientWidth = docEl.clientWidth;
                    if (clientWidth < 375) {
                        docEl.style.fontSize = 50 + 'px'
                    } else if (clientWidth > 750) {
                        docEl.style.fontSize = 100 + 'px'
                    } else {
                        docEl.style.fontSize = 100 * (clientWidth / 750) + 'px';
                    }
                };
        recalc();
        if (!doc.addEventListener) return;
        win.addEventListener(resizeEvt, recalc, false);
    })(document, window);
</script>