js 判断是否是date

function isDate(value) {
  return value instanceof Date;
}

console.log(isDate(new Date())); // true
console.log(isDate('2023-10-01')); // false

function isDate(value) {
  return value && typeof value === 'object' && value.constructor === Date;
}

console.log(isDate(new Date())); // true
console.log(isDate('2023-10-01')); // false

function isDate(value) {
  return Object.prototype.toString.call(value) === '[object Date]';
}

console.log(isDate(new Date())); // true
console.log(isDate('2023-10-01')); // false

console.log(isDate('2023-10-01')); // 可能会返回true

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

function isDate(value) {
  if (typeof value === 'string') {
    return isValidDate(value);
  }
  return value instanceof Date;
}

console.log(isDate('2023-10-01')); // false
console.log(isDate(new Date('2023-10-01'))); // true