H5前端 - 总结JavaScript, Date()时间格式和常用的方法和函数

/** 转换日期格式
 * @param date : 日期格式|String类型 (如：'2012-12-12' | '2012年12月12日' | new Date())
 * @param format : String类型 （如: 'yyyy年MM月dd日'或'yyyy年MM月dd日 hh时mm分ss秒',默认'yyyy-MM-dd'）
 * @example C.Utils.parseDateFormat(new Date(), 'yyyy年MM月dd日') 输出：'2014年04月29日'
 * @example C.Utils.parseDateFormat(new Date()) 输出：'2014-04-29'
 * @exmaple C.Utils.parseDateFormat('2014-05-07 16:09:47','yyyy年MM月dd日 hh时mm分ss秒')
 *          输出：'2014年05月07日 16时09分47秒'
 **/
const parseDateFormat = (date, format)=> {
    let year = '',
        month = '',
        day = '',
        hours = '',
        minutes = '',
        seconds = '',
        dateMatch;
    if (!date) {
        date = new Date();
    }
    function replaceDate(val) {
        return (val + '').toString().replace(/^(\d{4})(\d{2})(\d{2})$/, '$1/$2/$3');
    }

    if (date.length === 8) {
        date = replaceDate(date);
    } else if (date.length === 18) {
        date = replaceDate(date.substr(6, 8));
    } else if (date.length === 15) {
        // 19几几年的才有15位身份证的可能. 15位默认添加19
        date = replaceDate('19' + date.substr(6, 6));
    }
    format = format || 'yyyy-MM-dd';
    if (typeof date === 'string') {
        dateMatch = date.match(this.RegexMap.parseDateFormat);
        if (dateMatch) {
            year = dateMatch[1];
            month = dateMatch[2];
            day = dateMatch[3];
            hours = dateMatch[5];
            minutes = dateMatch[6];
            seconds = dateMatch[7];
        }
    } else {
        year = date.getFullYear();
        month = date.getMonth() + 1;
        day = date.getDate();
        hours = date.getHours();
        minutes = date.getMinutes();
        seconds = date.getSeconds();
    }
    month = addZero(month);
    day = addZero(day);
    hours = addZero(hours);
    minutes = addZero(minutes);
    seconds = addZero(seconds);
    return format.replace('yyyy', year).replace('MM', month).replace('dd', day).replace('hh', hours).replace('mm', minutes).replace('ss', seconds);
};

/**
 * 计算时间差
 * @param startDate 开始时间的时间戳
 * @param endDate 结束时间的时间戳
 * @returns {*} 输出：时间差
 */
const computeDate = (startDate, endDate)=> {
    let y, m, d, start, end;
    start = startDate ? new Date(startDate) : new Date(0);
    end = endDate ? new Date(endDate) : new Date(0);
    y = end.getFullYear() - start.getFullYear() + 1;
    m = end.getMonth() - start.getMonth();
    d = end.getDate() - start.getDate();
    if (y >= 0) {
        (m < 0 || (m === 0) && (d < 0 || d === 0)) && y--;
    } else {
        y = 0;
    }
    return y;
};

/*
* 相互转化中国标准时间
* @param 2016-11-11T10:52:28+08:00 <=> 2016-11-11 10:52:28
* 获取当前的年月日 时分秒
* @return 2018-03-19 16:57:44
 */
const formatTime = date=> {
  const year = date.getFullYear()
  const month = date.getMonth() + 1
  const day = date.getDate()
  const hour = date.getHours()
  const minute = date.getMinutes()
  const second = date.getSeconds()

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

const getDate = (type) => {
  var date = new Date();
  var year = date.getFullYear();
  var month = date.getMonth() + 1 < 10 ? "0" + (date.getMonth() + 1) : date.getMonth();
  var day = date.getDate() < 10 ? "0" + date.getDate() : date.getDate()
  var hour = date.getHours() < 10 ? "0" + date.getHours() : date.getHours();
  var minute = date.getMinutes() < 10 ? "0" + date.getMinutes() : date.getMinutes();
  var second = date.getSeconds() < 10 ? "0" + date.getSeconds() : date.getSeconds();

  if (type == "approvelsn") {
    var randomNum = (Math.random() * 9 + 1) * 100000 + "";
    var newNum = randomNum.split(".")
    return year + month + day + hour + minute + second + newNum[0];
  } else if (type == "time") {
    return year + "-" + month + "-" + day + " " + hour + ":" + minute + ":" + second;
  }
}