npm i @uiw/utilsimport { isLeapYear, solarMonthDays } from '@uiw/utils';Determine whether it is a leap year
const isLeapYear = (year: number) => {
if (year % 4 === 0 && year % 100 !== 0) return true;
else if (year % 400 === 0) return true;
return false;
};The first day of the month is the day of the week.
new Date(2021,6,1).getDay() // => 4Get the sun moon, commonly known as the solar calendar month By calculating the second month of the leap year, maybe 29 days
new Date(2021,6,0).getDate() // => 30Check if a date is the same as another date. Use Date.prototype.toISOString() and strict equality checking (===) to check if the first date is the same as the second one.
new Date(2021,6,1).toISOString() === new Date(2021,6,1).toISOString() // => trueGets the scroll value of the given element in the given side (top and left)
randomid()
// "5fan4z7qsa"