<!DOCTYPE html>
<html lang="zh">
    <head>
        <meta charset="utf-8" />
        <title>FireBase Example</title>
        <script src="https://www.gstatic.com/firebasejs/4.9.1/firebase.js"></script>
        <script>
          // Initialize Firebase
          var config = {
            apiKey: "AIzaSyAOSPYpgn7T_bKa6VbCaSeQlsw-3p3zqDs",
            authDomain: "yiibai-firebase.firebaseapp.com",
            databaseURL: "https://yiibai-firebase.firebaseio.com/",
            projectId: "yiibai-firebase",
            storageBucket: "yiibai-firebase.appspot.com",
            messagingSenderId: "334522625008"
          };
          firebase.initializeApp(config);

        var connectedRef = firebase.database().ref(".info/connected");

        connectedRef.on("value", function(snap) {
           if (snap.val() === true) {
              console.log("connected");
           } else {
              console.log("not connected");
           }
        });
        </script>
    </head>
<body>

</body>
</html>

當(dāng)運(yùn)行應(yīng)用程序時(shí)，彈出窗口會(huì)通知有關(guān)連接。

通過(guò)使用上面給出的功能，可以跟蹤連接狀態(tài)并相應(yīng)地更新您的應(yīng)用程序。

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