Gets the number of days in the given month
of the specified year
.
- Use the
Date
constructor to create a date from the givenyear
andmonth
. - Set the days parameter to
0
to get the last day of the previous month, as months are zero-indexed. - Use
Date.prototype.getDate()
to return the number of days in the givenmonth
.
代码实现
const daysInMonth = (year, month) => new Date(year, month, 0).getDate();
daysInMonth(2020, 12)); // 31
daysInMonth(2024, 2)); // 29