<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
</head>
<body>
<script>
console.log(getDays(2015,3,1));
function getDays(year,month,day){
var arr = [31,28,31,30,31,30,31,31,30,31,30,31];
for(var i=0;i<month-1;i++){
day += arr[i];
}
if(month>2 && isRN(year)){
day+=1;
}
return day;
}
function isRN(year){
if(year%4===0 && year%100!==0 || year%400===0){
return true;
}
return false;
}
</script>
</body>
</html>
原文：http://www.cnblogs.com/sj1988/p/6579905.html