js判断日期为空

function isDateEmpty(date) {
    return date === undefined || date === null || date === '';
}

// 使用示例
let date1;
let date2 = null;
let date3 = '';
let date4 = '2023-10-01';

console.log(isDateEmpty(date1)); // true
console.log(isDateEmpty(date2)); // true
console.log(isDateEmpty(date3)); // true
console.log(isDateEmpty(date4)); // false

function isValidDate(dateString) {
    const date = new Date(dateString);
    return !isNaN(date.getTime());
}

// 使用示例
let validDate = '2023-10-01';
let invalidDate = '2023-13-01'; // 无效月份

console.log(isValidDate(validDate)); // true
console.log(isValidDate(invalidDate)); // false

function isDateEmptyOrInvalid(date) {
    if (isDateEmpty(date)) {
        return true;
    }
    return !isValidDate(date);
}

// 使用示例
console.log(isDateEmptyOrInvalid(date1)); // true
console.log(isDateEmptyOrInvalid(date2)); // true
console.log(isDateEmptyOrInvalid(date3)); // true
console.log(isDateEmptyOrInvalid(date4)); // false
console.log(isDateEmptyOrInvalid(invalidDate)); // true