javascript实现在某个时间里返回星期和月的第一天和最后一天

最近在做项目时遇到要统计一个月内的计费，虽用服务器端代码实现了，但用客户端的脚本应更快些

比如在页面上放有如下图的控件时即可用脚本实现更好：



function fillstring(str)
{
if(str.length==1)
{
str = "0" + str;
}
return(str);
}
function quickseldate(type)
{
var begintime,endtime;
var oneminute = 60*1000;
var onehour = 60*oneminute;
var oneday = 24*onehour;
var oneweek = 7*oneday;
var todayDate = new Date();
var date = todayDate.getDate();
var month= todayDate.getMonth() +1;
var year= todayDate.getYear();
var day = todayDate.getDay();
if(navigator.appName == "Netscape")
{
year = 1900 + year;
}
//-->
if(type=="day")
{
begintime = year.toString() + "-" + fillstring(month.toString()) + "-" + fillstring(date.toString());
endtime = begintime;
}
else if(type=="week")
{
var daytoMon = day-1;
if(day==0)
daytoMon = 6;
todayDate.setTime(todayDate.getTime()-daytoMon*oneday);
date = todayDate.getDate();
month= todayDate.getMonth() +1;
year= todayDate.getYear();
day = todayDate.getDay();
begintime = year.toString() + "-" + fillstring(month.toString()) + "-" + fillstring(date.toString());
todayDate.setTime(todayDate.getTime()+6*oneday);
date = todayDate.getDate();
month= todayDate.getMonth() +1;
year= todayDate.getYear();
endtime = year.toString() + "-" + fillstring(month.toString()) + "-" + fillstring(date.toString());
}
else if(type=="month")
{
var dateto1 = date-1;
todayDate.setTime(todayDate.getTime()-dateto1*oneday);
date = todayDate.getDate();
month= todayDate.getMonth() +1;
year= todayDate.getYear();
day = todayDate.getDay();
begintime = year.toString() + "-" + fillstring(month.toString()) + "-" + fillstring(date.toString());
todayDate.setMonth(month);
todayDate.setTime(todayDate.getTime()-oneday);
date = todayDate.getDate();
month= todayDate.getMonth() +1;
year= todayDate.getYear();
endtime = year.toString() + "-" + fillstring(month.toString()) + "-" + fillstring(date.toString());
}
document.getElementById("Begintime").value = begintime;
document.getElementById("Endtime").value = endtime;
}

<script language="javascript">
function fillstring(str)
{
if(str.length==1)
{
str = "0" + str;
}
return(str);
}
function quickseldate(type)
{
var begintime,endtime;
var oneminute = 60*1000;
var onehour = 60*oneminute;
var oneday = 24*onehour;
var oneweek = 7*oneday;

var todayDate = new Date();
var date = todayDate.getDate();
var month= todayDate.getMonth() +1;
var year= todayDate.getYear();
var day = todayDate.getDay();
if(navigator.appName == "Netscape")
{
year = 1900 + year;
}
//-->

if(type=="day")
{
begintime = year.toString() + "-" + fillstring(month.toString()) + "-" + fillstring(date.toString());
endtime = begintime;
}
else if(type=="week")
{
var daytoMon = day-1;
if(day==0)
daytoMon = 6;

todayDate.setTime(todayDate.getTime()-daytoMon*oneday);
date = todayDate.getDate();
month= todayDate.getMonth() +1;
year= todayDate.getYear();
day = todayDate.getDay();

begintime = year.toString() + "-" + fillstring(month.toString()) + "-" + fillstring(date.toString());

todayDate.setTime(todayDate.getTime()+6*oneday);

date = todayDate.getDate();
month= todayDate.getMonth() +1;
year= todayDate.getYear();

endtime = year.toString() + "-" + fillstring(month.toString()) + "-" + fillstring(date.toString());
}
else if(type=="month")
{
var dateto1 = date-1;

todayDate.setTime(todayDate.getTime()-dateto1*oneday);
date = todayDate.getDate();
month= todayDate.getMonth() +1;
year= todayDate.getYear();
day = todayDate.getDay();

begintime = year.toString() + "-" + fillstring(month.toString()) + "-" + fillstring(date.toString());

todayDate.setMonth(month);
todayDate.setTime(todayDate.getTime()-oneday);

date = todayDate.getDate();
month= todayDate.getMonth() +1;
year= todayDate.getYear();

endtime = year.toString() + "-" + fillstring(month.toString()) + "-" + fillstring(date.toString());
}
document.getElementById("Begintime").value = begintime;
document.getElementById("Endtime").value = endtime;
}
</script>

function fillstring(str)
{
if(str.length==1)
{
str = "0" + str;
}
return(str);
}
function quickseldate(type)
{
var begintime,endtime;
var oneminute = 60*1000;
var onehour = 60*oneminute;
var oneday = 24*onehour;
var oneweek = 7*oneday;
var todayDate = new Date();
var date = todayDate.getDate();
var month= todayDate.getMonth() +1;
var year= todayDate.getYear();
var day = todayDate.getDay();
if(navigator.appName == "Netscape")
{
year = 1900 + year;
}
//-->
if(type=="day")
{
begintime = year.toString() + "-" + fillstring(month.toString()) + "-" + fillstring(date.toString());
endtime = begintime;
}
else if(type=="week")
{
var daytoMon = day-1;
if(day==0)
daytoMon = 6;
todayDate.setTime(todayDate.getTime()-daytoMon*oneday);
date = todayDate.getDate();
month= todayDate.getMonth() +1;
year= todayDate.getYear();
day = todayDate.getDay();
begintime = year.toString() + "-" + fillstring(month.toString()) + "-" + fillstring(date.toString());
todayDate.setTime(todayDate.getTime()+6*oneday);
date = todayDate.getDate();
month= todayDate.getMonth() +1;
year= todayDate.getYear();
endtime = year.toString() + "-" + fillstring(month.toString()) + "-" + fillstring(date.toString());
}
else if(type=="month")
{
var dateto1 = date-1;
todayDate.setTime(todayDate.getTime()-dateto1*oneday);
date = todayDate.getDate();
month= todayDate.getMonth() +1;
year= todayDate.getYear();
day = todayDate.getDay();
begintime = year.toString() + "-" + fillstring(month.toString()) + "-" + fillstring(date.toString());
todayDate.setMonth(month);
todayDate.setTime(todayDate.getTime()-oneday);
date = todayDate.getDate();
month= todayDate.getMonth() +1;
year= todayDate.getYear();
endtime = year.toString() + "-" + fillstring(month.toString()) + "-" + fillstring(date.toString());
}
document.getElementById("Begintime").value = begintime;
document.getElementById("Endtime").value = endtime;
}