输入某年某月某日，判断这一天是这一年的第几天？

来源：互联网发布：禅道部署到linux 编辑：程序博客网时间：2024/05/18 16:17

<!DOCTYPE html>
<html lang="en">

<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>

<body>
</body>
<script>
var y=parseInt(prompt('请输入年份'));
var m=parseInt(prompt('请输入月份'));
var d=parseInt(prompt('请输入几号'));
if(y>0&&m>0&&d>0&&m<=12&&d<=31){
if((y%4==0 && y%100!=0) || y%400==0)
{
feb = 29;
}else{
feb = 28;
}

switch(m)
{
case 1:
sum = d;
break;
case 2:
sum = 31 + d;
break;
case 3:
sum = 31+feb+d;
break;
case 4:
sum = 31+feb+31+d;
break;
case 5:
sum = 31+feb+31+30+d;
break;
case 6:
sum = 31+feb+31+30+31+d;
break;
case 7:
sum = 31+feb+31+30+31+30+d;
break;
case 8:
sum = 31+feb+31+30+31+30+31+d;
break;
case 9:
sum = 31+feb+31+30+31+30+31+31+d;
break;
case 10:
sum = 31+feb+31+30+31+30+31+31+30+d;
break;
case 11:
sum = 31+feb+31+30+31+30+31+31+30+31+d;
break;
case 12:
sum = 31+feb+31+30+31+30+31+31+30+31+30+d;
}
document.write(y+" 年 "+m+" 月 " + d + "号是今年的第"+sum+"天");
}else{
alert('输入有误')
}

</script>
</html>

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