Js判断日期是昨天、今天或明天，以及从日期中分别取出年月日时分秒

直接上源码：

    let yesterdayStr = '2022-01-10 12:20:45'
    let todayStr = '2022-01-11 09:18:22'
    let tomorrowStr = '2022-01-12 10:22:34'
    let dayAfterTomorrow = '2022-01-13 10:23:34'

    /*
    * 判断昨今明
    * */
    function caleDate(dayStr) {
        dayStr = new Date(dayStr).setHours(0, 0, 0, 0);
        let today = new Date().setHours(0, 0, 0, 0);
        let dateObj = {
            '-86400000': '昨天',
            0: '今天',
            86400000: '明天'
        }
        return dateObj[dayStr - today] || '超出昨今明范围';
    }

    console.log(caleDate(yesterdayStr))
    console.log(caleDate(todayStr))
    console.log(caleDate(tomorrowStr))
    console.log(caleDate(dayAfterTomorrow))

    /*
    * 获取年月日时分秒
    * */
    function getDate(dateStr) {
        let timeArr = dateStr.replace(" ", ":").replace(/\:/g, "-").split("-");
        if (timeArr.length < 6) return '格式错误'
        let result = {
            year: timeArr[0],
            month: timeArr[1],
            day: timeArr[2],
            hour: timeArr[3],
            minute: timeArr[4],
            seconds: timeArr[5]
        }
        return result;
    }

    console.log(getDate(yesterdayStr))
    console.log(getDate('传一个错误格式'))

运行结果：