//离下一个圣诞节还有多少天var now=new Date();var christ=new Date();var year=now.getFullYear();christ.setMonth(11);christ.setDate(25);var diff;var theTime;if(now.getTime()<=christ.getTime()){    diff=christ.getTime()-now.getTime();    theTime=parseInt(diff/(24*60*60*1000));}else {    christ=new Date((year+1)+"/12/25");//Date(datestring),Date(year,months,day,hours,minutes,seconds,ms),Date(milliseconds)
    diff=christ.getTime()-now.getTime();    theTime=parseInt(diff/(24*60*60*1000));}document.write("离下一个圣诞节还有："+theTime+"天");