JS如何获取特定格式的日期和时间

var currentDate = new Date();

var currentYear = currentDate.getFullYear();

var currentMonth = currentDate.getMonth() + 1;

var currentDay = currentDate.getDate();

var currentHour = currentDate.getHours();

var currentMinute = currentDate.getMinutes();

var currentSecond = currentDate.getSeconds();

var currentMillisecond = currentDate.getMilliseconds();

var currentWeekday = currentDate.getDay();

var formattedDate = currentYear + "-" + currentMonth + "-" + currentDay;
var formattedTime = currentHour + ":" + currentMinute + ":" + currentSecond;