js 获取当前日期时间

function getCurrentDate(fulldate = false, separator = ['-', ':']) {
    let currentTimeObj = new Date();

    let year = currentTimeObj.getFullYear();
    let month = (currentTimeObj.getMonth() + );
    month = month >=  ? month : '' + month;
    let day = currentTimeObj.getDate();
    day = day >=  ? day : '' + day;
    let hour = currentTimeObj.getHours();
    hour = hour >=  ? hour : '' + hour;
    let minute = currentTimeObj.getMinutes();
    minute = minute >=  ? minute : '' + minute;
    let second = currentTimeObj.getSeconds();
    second = second >=  ? second : '' + second;

    if (fulldate) {
        let ymd = [year, month, day];
        let his = [hour, minute, second];
        return ymd.join(separator[]) + ' ' + his.join(separator[]);
    } else {
        let ymd = [year, month, day];
        return ymd.join(separator[]);
    }
}