//清除日志，只保留7日日志
function unlinklog()
{
    var path = './Log'
    setInterval(()=>{
      fs.exists(path,(s)=>{
          if(s){
              let files =  fs.readdirSync(path) //获取文件夹内容
              if(files.length > 7){
                  //遍历文件夹内容
                  files.forEach(function(file) {
                  let  stat =  fs.statSync(path+'/'+ file)
                  let logtime = Math.round(stat.mtimeMs)
                  let times =  (Math.round(new Date() / 1000) - (3600*24*10))*1000
                    if(logtime < times ){
                          fs.unlinkSync(path+'/'+file)
                      }
                })
              }else{
                  logWrite(path+"日志文件夹内容总数："+files.length)
              }
          } 
      })
    },1000*60*60)
    
}