func init() {
bc = beego.NewBeeCache()
bc.Every = 259200 //該單位為秒，0為不過期，259200 三天,604800 即一個星期清空一次緩存
bc.Start()
}
func init() {
shortyLookup = beego.NewBeeCache()
shortyLookup.Every = DONT_EXPIRE
shortyLookup.Start()
beego.AddFuncMap("printShorties", printShorties)
}