function px2pm(d) {
var iswindow = /windows|win32/i.test(navigator.userAgent);
if (iswindow) {
return Math.round(d * 25.4 / 96);//電腦端
} else {
return Math.round(d * 25.4 / 72);//手機端
}
}

            function pm2px(d) {
                var iswindow = /windows|win32/i.test(navigator.userAgent);
                if (iswindow) {
                    return Math.round(d * 96 / 25.4);
                } else {
                    return Math.round(d * 72 / 25.4);
                }
            }