Web Front-endJS TutorialJavaScript method to calculate what day of the week a certain day is_javascript skills
The example in this article describes how to calculate the day of the week in JavaScript. Share it with everyone for your reference. The details are as follows:
JavaScript calculates the day of the week that a certain day is. The default value is in the text box. As long as you enter the date and time in this format, you can calculate the day of the week that day is. A simple JS time calculation example. After running this effect, only Just click the "Calculate" button to display the effect, so that we can quickly know what day of the week a certain day is.
The operation effect diagram is as follows:
<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>
I hope this article will be helpful to everyone’s JavaScript programming design.
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