js 时间增加函数

<script type="text/javascript">function printLine(s){    document.write(s,"<br />");}function timeParse(timeString,pattern){    var date=new Date();    var match=timeString.match(pattern);    date.setYear(parseInt(match[1],10));    date.setMonth(parseInt(match[2],10)-1);    date.setDate(parseInt(match[3],10));    date.setHours(parseInt(match[4],10));    date.setMinutes(parseInt(match[5],10));    date.setSeconds(0);    return date;}Date.prototype.addTime=function(timeSpan){    this.setYear(this.getYear()+timeSpan.years);    this.setMonth(this.getMonth()+timeSpan.months);    this.setDate(this.getDate()+timeSpan.days);    this.setHours(this.getHours()+timeSpan.hours);    this.setMinutes(this.getMinutes()+timeSpan.minutes);}Date.prototype.toString=function(){    return this.getYear()+"-"        +(this.getMonth()+1)+"-"        +this.getDate()+" "        +this.getHours()+":"        +this.getMinutes();}function timeSpanParse(timeSpanString,pattern){    var match=timeSpanString.match(pattern);    var y=match[1]==""?0:parseInt(match[1]);    var mon=match[2]==""?0:parseInt(match[2]);    var d=match[3]==""?0:parseInt(match[3]);    var h=match[4]==""?0:parseInt(match[4]);    var m=match[5]==""?0:parseInt(match[5]);    return {years:y,months:mon,days:d,hours:h,minutes:m};}var reg_time=/^(\d{1,4})\-(\d{1,2})\-(\d{1,2}) (\d{1,2}):(\d{1,2})$/;var date=timeParse("2008-8-8 09:00",reg_time);printLine(date);var reg_timeSpan=/^(?:(\d+)年)?(?:(\d+)个?月)?(?:(\d+)天)?(?:(\d+)小时)?(?:(\d+)分钟?)?$/;var timeSpan=timeSpanParse("10分",reg_timeSpan);date.addTime(timeSpan);printLine("增加10分钟后:"+date);timeSpan=timeSpanParse("3小时10分",reg_timeSpan);date.addTime(timeSpan);printLine("增加3小时10分后:"+date);timeSpan=timeSpanParse("2天3小时10分",reg_timeSpan);date.addTime(timeSpan);printLine("增加2天1小时5分后:"+date);timeSpan=timeSpanParse("1个月1天1小时1分",reg_timeSpan);date.addTime(timeSpan);printLine("增加1个月1天1小时1分后:"+date);timeSpan=timeSpanParse("2年1小时1分钟",reg_timeSpan);date.addTime(timeSpan);printLine("增加2年1小时1分钟后:"+date);</script>