js对日期函数的操作（转）
Date.prototype.dateCompare=function(date){
if(typeof(date)!="object"||!(/Date/.test(date.constructor)))
thrownewError(-1,"dateCompare(date)的date参数为Date类型.");
vard=this.getTime()-date.getTime();
returnd>0?1:(d==0?0:-1);
}
/**//*功能:返回两日期之差
*参数:pd PowerDate对象
* type:返回类别标识.yy:年,mm:月,ww:周,dd:日,hh:小时,mi:分,ss:秒,ms:毫秒
* intOrFloat:返回整型还是浮点型值0:整型,不等于0:浮点型
* output:输出提示,如:时间差为#周!
*/
Date.prototype.calDateDistance=function(date,type,intOrFloat,output){
if(typeof(date)!="object"||!(/Date/.test(date.constructor)))
thrownewError(-1,"calDateDistance(date,type,intOrFloat)的date参数为Date类型.");
type=(type==null?'dd':type);
if(!((newRegExp(type+",","g")).test("yy,mm,ww,dd,hh,mi,ss,ms,")))
thrownewError(-1,"calDateDistance(pd,type,intOrFloat,output)的type参数为非法.");
variof=(intOrFloat==null?0:intOrFloat);
varnum=0;
varo={
"ww":7*86400000,
"dd":86400000,
"hh":3600000,
"mi":60000,
"ss":1000,
"ms":1
}
switch(type){
case"yy":num=this.getFullYear()-date.getFullYear();break;
case"mm":num=(this.getFullYear()-date.getFullYear())*12+this.getMonth()-date.getMonth();break;
default:
varsub=this.valueOf()-date.valueOf();
if(o[type])
num=(sub/o[type]).fmtRtnVal(iof);
break;
}
return(output?output.replace(/#/g,""+num+""):num);
}
//返回整数或者两位小数的浮点数
Number.prototype.fmtRtnVal=function(intOrFloat){
return(intOrFloat==0?Math.floor(this):parseInt(this*100)/100);
}
//根据当前日期所在年和周数返回周日的日期
Date.prototype.RtnByWeekNum=function(weekNum){
if(typeof(weekNum)!="number")
thrownewError(-1,"RtnByWeekNum(weekNum)的参数是数字类型.");
vardate=newDate(this.getFullYear(),0,1);
varweek=date.getDay();
week=(week==0?7:week);
returndate.dateAfter(weekNum*7-week,1);
}
//根据日期返回该日期所在年的周数
Date.prototype.getWeekNum=function(){
vardat=newDate(this.getFullYear(),0,1);
varweek=dat.getDay();
week=(week==0?7:week);
vardays=this.calDateDistance(dat,"dd")+1;
return((days+6-this.getDay()-7+week)/7);
}
//-->
</script>
<scriptlanguage="JavaScript">
<!--
vardw=document.write;
vardate2="2005-12-30".parseDate();
dw(date2,"<br>");
vardate3="2006-1-10111111".parseDate();
dw(date2.calDateDistance(date3,null,null,"时间差为#天!"));
//alert(newDate(2000,2,-29));
//-->
</script>
