js 获取每月最后一天

    let y = new Date().getFullYear()

 

    let m = new Date().getMonth() + 1

 

    let lastDay = new Date(y, m, 0).getDate()

 

    console.log('lastDay: ', lastDay); // lastDay:  31

 

    let date = y + '-' + m + '-' + lastDay

 

    console.log('date: ', date); // date:  2022-5-31