输入年月日可以计算是第几周第几天
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<!-- <script>
//求输入天数是第几周第几天以及总共的天数的
function day(n, m, l) {
var a = n;
var b = m;
var c = l;
var sum = 0;
switch (b) {
case 12:
sum += 30;
case 11:
sum += 31;
case 10:
sum += 30;
case 9:
sum += 31;
case 8:
sum += 31;
case 7:
sum += 30;
case 6:
sum += 31;
case 5:
sum += 30;
case 4:
sum += 31;
case 3:
sum += 28;
if ((a % 4 == 0 && a % 100 != 0) || a % 400 == 0) {
sum += 1;
}
case 2:
sum += 31;
case 1:
sum += c;
break;
default:
alert("cuoyuedeyuefen");
break;
}
var c =parseInt(sum / 7) + 1 + "周";
return c + "的第" + parseInt(sum / 7) + "天";
}
document.write(day(2020, 2, 28));
</script> -->
<script>
function day(n, m, l) {
var a = n;
var b = m;
var c = l;
var sum = 0;
switch (b) {
case 12:
sum += 30;
case 11:
sum += 31;
case 10:
sum += 30;
case 9:
sum += 31;
case 8:
sum += 31;
case 7:
sum += 30;
case 6:
sum += 31;
case 5:
sum += 30;
case 4:
sum += 31;
case 3:
sum += 28;
if ((a % 4 == 0 && a % 100 != 0) || a % 400 == 0) {
sum += 1;
}
case 2:
sum += 31;
case 1:
sum += c;
break;
default:
alert("cuoyuedeyuefen");
break;
}
return '这是'+ sum + "天";
}
document.write(day(2000,5,21))
</script>
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