获得某月份某日为该年份的第几日

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>
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