仿微信时间日期格式

仿微信时间日期格式：
刚刚、x小时前、x天前

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, second].map(formatNumber).join(':')
}

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

const formatTimeName = date => {
  const t = date.getTime()
  const now = new Date()
  const tn = now.getTime()
  const difft = (tn - t)/1000
  
  if(difft<10){
    return '刚刚'
  }
  const s = 60
  if (difft < s) {
    return Math.floor(difft) + '秒前'
  }

  const h = 3600
  if(difft<h){
    return Math.floor(difft/s) + '分钟前'
  }
  const d = 3600*24
  if(difft<d){
    return Math.floor(difft/h) + '小时前'
  }
  const w = 3600*24*7
  const td = Math.floor(difft / d)
  if(difft<w){
   return td + '天前'
  }
  if (now.getFullYear() === date.getFullYear()){
    return [date.getMonth() + 1, date.getDate()].map(formatNumber).join('-') + ' ' + [date.getHours(), date.getMinutes()].map(formatNumber).join(':')
  }
  
  return formatTime(date)
}