text: let logStr = ''
  
  let logSave = (addStr) => {
      if (typeof(addStr) !== 'string') {
          return
      }
      try {
          if (process.env.localFlag === 'true') {
              let timestr = new Date().toISOString()
              console.log(`${timestr}: ${addStr}`)
          }
          logStr += `${addStr}\n`
      } catch(e) {
          console.log(`logSave error happened:${e}`)
      }
  }
  let logGet = () => {
      return logStr
  }
  let logClear = () => {
      logStr = ''
  }
  
  module.exports = {logSave, logGet, logClear}
  