s刚入门，自己写写代码当练习。计算n天后是星期几
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>计算n天后是星期几</title>
</head>
<style>
body{
background-color:gray;
}
#div1{
background-color:#ddffcc;
width:300px;
height:300px;
margin:10px auto;
}
</style>
<script language="javascript">
<!--
window.onload=function(){
var oDiv=document.getElementById("div1");
var oP=document.getElementById("p1");
var oText1=document.getElementById("txt1");
var oText2=document.getElementById("txt2");
var oBtn=document.getElementById("btn");
function weeks(week,n){
var today=0;
var text="";
switch(week){
case "星期一":today=1;
break;
case "星期二":today=2;
break;
case "星期三":today=3;
break;
case "星期四":today=4;
break;
case "星期五":today=5;
break;
case "星期六":today=6;
break;
case "星期天":today=7;
break;
default:text="输入格式错误，请出入正确的格式";
}
var day=n%7;
today=(day+today)%7;
switch(today){
case 1:weekd="星期一";
break;
case 2:weekd="星期二";
break;
case 3:weekd="星期三";
break;
case 4:weekd="星期四";
break;
break;
case 5:weekd="星期五";
break;
case 6:weekd="星期六";
break ;
case 0:weekd="星期天";
break;
default:text="输入格式错误，请出入正确的格式";
}
if(!text){
text="今天是"+week+","+n+"天后是"+weekd;
}
oP.innerHTML=text;
}
weeks(oText1.value,oText2.value);
oBtn.onclick=function(){
weeks(oText1.value,oText2.value);
}
}
-->
</script>
<body>
</body>
<div id="div1">
<input id="txt1" type="text" value="星期天" size="10">
<input id="txt2" type="text" value="100" size="10" >
<input id="btn" type="button" value="计算" >
<p id="p1"></p>
</div>
</html>