sonoff esp8266

Hi, forgive me for my bad english. I'm using a sonoff module that have a relay and a led. I have falsh firmware with espruino v1.87 and I have wrote a code to control the relay and the led from a we page.

If I use the board connected on USB, it works well. But when I add the save() function, I can't control anymore the relay and the led. If I plugg off the usb and connect the board to 220V (france), the board is not responding on wifi. So I think that the board doesn't store my code:

var relay = D12;
var led = D13;

function toggleDevice(toggle){
  digitalWrite(relay, toggle);
  digitalWrite(led, toggle);
}

function startServer() {
  var http = require('http');
  var httpServer = http.createServer(function(req, res) {
    var params = url.parse(req.url, true);

    if (params.query !== null && params.query.device !== "") {
      var status = params.query.device;
      toggleDevice(status);
    }
    res.end("<h1>Hello world</h1>");
  });

  httpServer.listen(80);
  print('HTTP server is running');
}

function onInit() {
  var wifiSSID = "xxxxxx";
  var wifiPass = "xxxxxxxx";

  var wifi = require('Wifi');
  wifi.connect(wifiSSID, {password:wifiPass}, function(err, data){
    if (err) {
      print('Error while connecting to access point' + wifiSSID);
      return;
    }

    print("connected? err=", err, "info=", wifi.getIP());
    startServer();
  });
  wifi.stopAP();
  wifi.save();
}

E.on('init', onInit());
//save(); 

Any idea please ?