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JavaScript输入年月日计算某一天是星期几

时间：2014-05-23 08:40 来源：互联网作者：源码搜藏收藏推荐

<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>

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