JS - 日期 - 獲取一個日期的星期

函數

function _getDayOfWeek(theDate) {
    let dayOfWeek = new Date(theDate).getDay();
    switch (dayOfWeek) {
        case 0:
            dayOfWeek = 'Sunday';
            break;
        case 1:
            dayOfWeek = 'Monday';
            break;
        case 2:
            dayOfWeek = 'Tuesday';
            break;
        case 3:
            dayOfWeek = 'Wednesday';
            break;
        case 4:
            dayOfWeek = 'Thursday';
            break;
        case 5:
            dayOfWeek = 'Friday';
            break;
        case 6:
            dayOfWeek = 'Saturday';
            break;
        default:
            break;
    }
    return dayOfWeek;
}

測試

console.info(_getDayOfWeek('2019-05-05')); // Sunday