function setDate(dateInput) {
// 日期格式化為 MM-DD-YYYY
var dateString = dateInput.value.split('-')[2].replace('-', '/');
// 將日期儲存到 JavaScript 碼值中
var today = new Date();
var todayString = today.getFullYear() + '-' + (today.getMonth() + 1) + '-' + today.getDate();
// 將日期格式化為 MM-DD-YYYY,從碼值中寫出日期
dateInput.value = todayString;
}