<html>
<head>
<title>计算某一天是星期几</title>
<style type=
"text/css"
>
.style5 {font-size: 12px}
</style>
</head>
<script language=
"javascript"
>
function
checktext()
{
if
((form1.yeartext.value ==
""
) && (form1.monthtext.value ==
""
) && (form1.datetext.value ==
""
))
{
alert(
"请输入相关信息!"
);
form1.yeartext.focus();
return
;
}
if
((form1.yeartext.value.length !=4 ) && (form1.monthtext.value.length !=1 ) && (form1.datetext.value.length !=1 ))
{
alert(
"输入错误,只能输入4位数!"
);
form1.yeartext.focus();
return
;
}
}
function
mod(x, x_div)
{
for
(
var
i=x; i>=x_div; i -= x_div);
return
i;
}
function
getday()
{
var
currentyear = parseInt(form1.yeartext.value,10);
var
currentmonth = parseInt(form1.monthtext.value,10);
var
currentday = parseInt(form1.datetext.value,10);
var
sig_val;
var
begindate =
new
Array(0,3,3,6,1,4,6,2,5,0,3,5);
var
rundate =
new
Array(-1,2,2,5,0,3,5,1,4,-1,2,4);
var
Pmonth =
new
Array(29,31,28,31,30,31,30,31,31,30,31,30,31)
var
montharray =
new
Array(
"星期日"
,
"星期一"
,
"星期二"
,
"星期三"
,
"星期四"
,
"星期五"
,
"星期六"
);
sig_val =begindate[currentmonth - 1];
var
val1 = mod((currentyear + parseInt(currentyear/4) + currentday + sig_val)-2,7);
var
M=parseInt(document.all.monthtext.value);
var
D=parseInt(document.all.datetext.value);
if
((currentyear%4==0 && currentyear%100!=0)||(currentyear%400==0))
{
if
((M<13)&&(M>0)){
if
((M==2)&&(D>Pmonth[0])){alert(
'输入错误'
);document.all.resulttext.value=
''
;}
else
{
if
((D>Pmonth[M])&&(M!=2)){alert(
'输入错误'
);document.all.resulttext.value=
''
;}
else
{
sig_val =rundate[currentmonth - 1];
val1 = mod((currentyear + parseInt(currentyear/4) + currentday + sig_val)-2,7);
if
(M>2){val1+=1;}
form1.resulttext.value =montharray[val1];
}
}
}
else
{alert(
'输入错误'
);document.all.resulttext.value=
''
;}
}
else
{
if
((M<13)&&(M>0)){
if
(D>Pmonth[M]){alert(
'输入错误'
);document.all.resulttext.value=
''
;}
else
{form1.resulttext.value =montharray[val1];}
}
else
{alert(
'输入错误'
);document.all.resulttext.value=
''
;}
}
}
</script>
<body>
<center>
<form name=
"form1"
method=
"post"
action=
""
>
<table width=
"308"
border=
"1"
cellpadding=
"3"
cellspacing=
"1"
bordercolor=
"#33CCFF"
bgcolor=
"#CCFFFF"
>
<tr bgcolor=
"#FFFFFF"
>
<td align=
"center"
class
=
"style5"
>输入年:</td>
<td width=
"170"
><input name=
"yeartext"
type=
"text"
id=
"yeartext"
value=
"2016"
></td>
</tr>
<tr bgcolor=
"#FFFFFF"
>
<td align=
"center"
class
=
"style5"
>输入月:</td>
<td><input name=
"monthtext"
type=
"text"
value=
"2"
></td>
</tr>
<tr bgcolor=
"#FFFFFF"
>
<td align=
"center"
class
=
"style5"
>输入日:</td>
<td><input name=
"datetext"
type=
"text"
value=
"2"
></td>
</tr>
<tr bgcolor=
"#FFFFFF"
>
<td align=
"center"
><span
class
=
"style5"
>星 期:</span></td>
<td><input name=
"resulttext"
type=
"text"
id=
"resulttext"
></td>
</tr>
<tr align=
"center"
bgcolor=
"#FFFFFF"
>
<td colspan=
"2"
>
<div align=
"right"
>
<input name=
"enter"
type=
"button"
value=
"计算"
onClick=
"checktext();getday();"
>
</div>
</td>
</tr>
</table>
</form>
</center>
</body>
</html>