JS时间戳转YYYYMMDD HH:MM:SS

 // 使用es6的padStart()方法来补0
  getYMDHMS (timestamp) {
      let time = new Date(timestamp)
      let year = time.getFullYear()
      const month = (time.getMonth() + 1).toString().padStart(2, '0')
      const date = (time.getDate()).toString().padStart(2, '0')
      const hours = (time.getHours()).toString().padStart(2, '0')
      const minute = (time.getMinutes()).toString().padStart(2, '0')
      const second = (time.getSeconds()).toString().padStart(2, '0')

      return year + '-' + month + '-' + date + ' ' + hours + ':' + minute + ':' + second
    }