移动端屏幕大小变化后重新设置rem字号

<script type="text/javascript">
        (function () {
            var docEl = document.documentElement;
            var resize = 'orientationchange' in window ? 'orientationchange' : 'resize';
            var setRem = function () {
                var screenWidth = docEl.clientWidth || window.screen.width || 375;
                docEl.style.fontSize = (100 * screenWidth / 1000) + 'px';
            };
            // 屏幕大小变化后重新设置rem字号
            window.addEventListener(resize, setRem, false);
            setRem();
        })();
    </script>