NodeMCU连接wifi语句报错：“stdin:1: bad argument #1 to 'config' (config table not found!)”

wifi.sta.config("Router"," 123456789")

wifi.sta.config{ssid="Router", pwd="123456789"}

--connect to Access Point (DO NOT save config to flash)
station_cfg={}
station_cfg.ssid="NODE-AABBCC"
station_cfg.pwd="password"
wifi.sta.config(station_cfg)

--connect to Access Point (DO save config to flash)
station_cfg={}
station_cfg.ssid="NODE-AABBCC"
station_cfg.pwd="password"
station_cfg.save=true
wifi.sta.config(station_cfg)

--connect to Access Point with specific MAC address  
station_cfg={}
station_cfg.ssid="NODE-AABBCC"
station_cfg.pwd="password"
station_cfg.bssid="AA:BB:CC:DD:EE:FF"
wifi.sta.config(station_cfg)

--configure station but don't connect to Access point
station_cfg={}
station_cfg.ssid="NODE-AABBCC"
station_cfg.pwd="password"
station_cfg.auto=false
wifi.sta.config(station_cfg)