重构上线逻辑

[JiYouMCC]

上线提醒要正常一些，浏览器记忆的在线不算数

[JiYouMCC]

var config = {
  authDomain: "<appId>.wilddog.com",
  syncURL: "https://<appId>.wilddogio.com"
};
wilddog.initializeApp(config);
var connectedRef = wilddog.sync().ref("/.info/connected");
connectedRef.on("value", function(snap) {
  if (snap.val() === true) {
    alert("connected");
  } else {
    alert("not connected");
  }
});