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js算出生日是当年第多少天

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08/04
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var year, month, day, monthSum = 0;
var arr = new Array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
function getDate() { year = Number(prompt("请输入年"));
month = Number(prompt("请输入你的出生月份"));
day = Number(prompt("请输入你的出生日期")); for (var i = 0; i < month - 1; i++) {
monthSum = monthSum + arr[i]
}
if ((year % 400 == 0 || (year % 4 == 0 && year % 100 != 0)) && month > 2) {
monthSum = monthSum + day + 1
document.write("您的生日在" + year + "年" + "是第" + monthSum + "天");
} else {
monthSum = monthSum + day
document.write("您的生日在" + year + "年" + "是第" + monthSum + "天");
}
}
getDate();