function rem() {

    var htmlEle = document.documentElement;

    var winWidth = htmlEle.clientWidth || document.body.clientWidth;

    var width = winWidth <= 1024 ? 1024 : winWidth;

    htmlEle.style.fontSize = Math.ceil(100 * (width / 1920)) + 'px';

    htmlEle.style.height = htmlEle.clientHeight + 'px';

    htmlEle.style.minWidth = 1024 + 'px';

};

rem();

window.onresize = function() {

    rem();

}