function dateTime(date, fmt) {
  if (fmt === void 0) {
    fmt = 'yyyy年MM月dd日 hh:mm';
  }

  // 时间戳转换
  if (!date) return '';
  var d = new Date(date);
  var o = {
    "M+": d.getMonth() + 1,
    //月份
    "d+": d.getDate(),
    //日
    "h+": d.getHours(),
    //小时
    "m+": d.getMinutes(),
    //分
    "s+": d.getSeconds() //秒

  }; // 根据y的长度来截取年

  if (/(y+)/.test(fmt)) {
    fmt = fmt.replace(RegExp.$1, (d.getFullYear() + "").substr(4 - RegExp.$1.length));
  }

  for (var k in o) {
    if (new RegExp("(" + k + ")").test(fmt)) fmt = fmt.replace(RegExp.$1, RegExp.$1.length == 1 ? o[k] : ("00" + o[k]).substr(("" + o[k]).length));
  }

  return fmt;
}

function dateYear() {
  // 获取当年的第一天
  var date = new Date();
  date.setDate(1);
  date.setMonth(0);
  return date.getTime();
}

function dateLast() {
  // 获取昨天
  var day = new Date();
  day.setTime(day.getTime() - 24 * 60 * 60 * 1000);
  return dateTime(day, 'yyyy/MM/dd');
}

function dateMatter(time, drag = 'normal') {
  // 时间转换
  var timeStr = '';
  var currentDay = dateTime(time, 'yyyy/MM/dd'); // 当前日期

  var lingDay = new Date(new Date().toLocaleDateString()).getTime(); // 获取当天0点

  var isTime = new Date(time) - lingDay;
  var diff = isTime < 0 ? '昨天' : '';
  var isDate = new Date(time) - dateYear();

  if (isDate < 0) {
    drag == 'normal' ? timeStr = dateTime(time) : timeStr = dateTime(time, 'yyyy年MM月dd日');
  } else {
    if (currentDay === dateLast()) {
      drag == 'normal' ? timeStr = diff + dateTime(time, 'hh:mm') : timeStr = diff;
    } else {
      if (isTime < 0) {
        drag == 'normal' ? timeStr = dateTime(time, 'MM月dd日 hh:mm') : timeStr = dateTime(time, 'MM月dd日');
      } else {
        timeStr = dateTime(time, 'hh:mm');
      }
    }
  }

  return timeStr;
}