获得某月份某日为该年份的第几日

最新推荐文章于 2025-08-11 19:52:03 发布

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本文介绍了一个简单的JavaScript程序，该程序通过用户输入的出生年月日来计算这一天是一年中的第几天，并考虑了闰年的情况。

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<!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>
<script>
var year =
prompt("输入你的出生年份");
var month =
prompt("输入你出生的月份");
var day =
prompt("输入你的出生日期");
getday(parseInt(year),
parseInt(month),
parseInt(day));

function getday(year,
month, day) {
var sum =
0;
if (year %
100 == 0 &&
year % 400 !=
0 || year %
4 == 0) {
switch (month) {
case 1:
sum = day;
break;
case 2:
sum = 31 +
day;
break;
case 3:
sum = 60 +
day;
break;
case 4:
sum = 91 +
day;
break;
case 5:
sum = 121 +
day;
break;
case 6:
sum = 152 +
day;
break;
case 7:
sum = 182 +
day
break;
case 8:
sum = 213 +
day;
break;
case 9:
sum = 244 +
day;
break;
case 10:
sum = 274 +
day;
break;
case 11:
sum = 305 +
day;
break;
case 12:
sum = 335 +
day;
}
} else {
switch (month) {
case 1:
sum = day;
break;
case 2:
sum = 30 +
day;
break;
case 3:
sum = 59 +
day;
break;
case 4:
sum = 90 +
day;
break;
case 5:
sum = 120 +
day;
break;
case 6:
sum = 151 +
day;
break;
case 7:
sum = 181 +
day
break;
case 8:
sum = 212 +
day;
break;
case 9:
sum = 243 +
day;
break;
case 10:
sum = 273 +
day;
break;
case 11:
sum = 304 +
day;
break;
case 12:
sum = 334 +
day;
}
}
alert("您的生日在第" +
year + "年，是第" +
sum + "天");
}
</script>
</body>

</html>