Update webstats_common.lua

plugins/webstats/lua/webstats_common.lua

@@ -36,9 +36,6 @@ function _M.new(self)
         params = nil,
         site_config = nil,
         config = nil,
-        cron_num = 0,
-        cron_num_limit = 4,
-
     }
     -- self.dbs = {}
     return setmetatable(self, mt)
@@ -256,12 +253,6 @@ end
 
 -- 后台任务
 function _M.cron(self)
-    self.cron_num = self.cron_num + 1
-    if self.cron_num > self.cron_num_limit then
-        return
-    end
-    
-    -- self:D("PID:"..tostring(ngx.worker.id())..",cron_num:"..tostring(self.cron_num))
 
     local timer_every_get_data = function (premature)