(function () { // rem換算zx
            var resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize';
            var docEl = document.documentElement;
            function resizeFn() {
                var docW = docEl.clientWidth;
                if (docW > 750) {
                    docW = 750
                }
                docEl.style.fontSize = (docW * 100 / 750) + 'px';
            }
            resizeFn();

            window.addEventListener(resizeEvt, resizeFn);
        })()