js时间戳、日期相互转换

/*
 timeStr:时间，格式可为："September 16,2016 14:15:05、
 "September 16,2016"、"2016/09/16 14:15:05"、"2016/09/16"、
 ‘2014-04-23T18:55:49‘和毫秒
 dateSeparator：年、月、日之间的分隔符，默认为"-"，
 timeSeparator：时、分、秒之间的分隔符，默认为":"
 */
function getFormatDate(timeStr, dateSeparator, timeSeparator) {
    dateSeparator = dateSeparator ? dateSeparator : "-";
    timeSeparator = timeSeparator ? timeSeparator : ":";
    var date = new Date(timeStr),
            year = date.getFullYear(),// 获取完整的年份(4位,1970)
            month = date.getMonth(),// 获取月份(0-11,0代表1月,用的时候记得加上1)
            day = date.getDate(),// 获取日(1-31)
            hour = date.getHours(),// 获取小时数(0-23)
            minute = date.getMinutes(),// 获取分钟数(0-59)
            seconds = date.getSeconds(),// 获取秒数(0-59)
            Y = year + dateSeparator,
            M = ((month + 1) > 9 ? (month + 1) : (‘0‘ + (month + 1))) + dateSeparator,
            D = (day > 9 ? day : (‘0‘ + day)) + ‘ ‘,
            h = (hour > 9 ? hour : (‘0‘ + hour)) + timeSeparator,
            m = (minute > 9 ? minute : (‘0‘ + minute)) + timeSeparator,
            s = (seconds > 9 ? seconds : (‘0‘ + seconds)),
            formatDate = Y + M + D + h + m + s;
    return formatDate;
}