function formatTime(date) {
    var year = date.getFullYear()
    var month = date.getMonth() + 1
    var day = date.getDate()

    var hour = date.getHours()
    var minute = date.getMinutes()
    var second = date.getSeconds()


    return [year, month, day].map(formatNumber).join('/') + ' ' + [hour, minute, second].map(formatNumber).join(':')
}

function formatNumber(n) {
    n = n.toString()
    return n[1] ? n : '0' + n
}

// 获取前一天
//只需要改变这里就OK，-1是昨天，0是今天，1是后一天
function beforeDay (today, addDayCount) {
   let date;
     if (today) {
       date = new Date(today);
     } else {
       date = new Date();
     }
     date.setDate(date.getDate() + addDayCount); //获取AddDayCount天后的日期 
     let y = date.getFullYear();
     let m = date.getMonth() + 1; //获取当前月份的日期 
     let d = date.getDate();
     if (m < 10) {
       m = '0' + m;
     };
     if (d < 10) {
       d = '0' + d;
     };
     console.log(y + "-" + m + "-" + d)
     return y + "-" + m + "-" + d;
}


/** 
 * 时间戳转化为年 月 日 时 分 秒 
 * number: 传入时间戳 
 * format：返回格式，支持自定义，但参数必须与formateArr里保持一致 
*/
function formatTimeTwo(number, format) {

    var formateArr = ['Y', 'M', 'D', 'h', 'm', 's'];
    var returnArr = [];

    var date = new Date(number);
    returnArr.push(date.getFullYear());
    returnArr.push(formatNumber(date.getMonth() + 1));
    returnArr.push(formatNumber(date.getDate()));

    returnArr.push(formatNumber(date.getHours()));
    returnArr.push(formatNumber(date.getMinutes()));
    returnArr.push(formatNumber(date.getSeconds()));

    for (var i in returnArr) {
        format = format.replace(formateArr[i], returnArr[i]);
    }
    return format;
}

module.exports = {
    formatTime: formatTime,
    formatTimeTwo: formatTimeTwo ,
    beforeDay: beforeDay  
}