new function () {
    var _self = this;
    _self.width = 720; //设置默认最大宽度
    _self.fontSize = 100; //默认字体大小
    _self.widthProportion = function () { var p = (document.body && document.body.clientWidth || document.getElementsByTagName("html")[0].offsetWidth) / _self.width; return p > 1 ? 1 : p < 0.4444 ? 0.4444 : p; }; //alert(_self.widthProportion());                                                  页面比例720*0.444
    _self.changePage = function () {
        document.getElementsByTagName("html")[0].setAttribute("style", "font-size:" + _self.widthProportion() * _self.fontSize + "px !important");
    }
    _self.changePage();
   window.addEventListener('resize', function () { _self.changePage(); }, false);
};