使用firebase

<script src="https://www.gstatic.com/firebasejs/3.6.5/firebase.js"></script>
<script>
  // Initialize Firebase
  var config = {
    apiKey: "AIzaSyBANZv2bjoifiFmAJKpSwltchZjPA7bqnY",
    authDomain: "myhope615.firebaseapp.com",
    databaseURL: "https://myhope615.firebaseio.com",
    storageBucket: "myhope615.appspot.com",
    messagingSenderId: "285542370758"
  };
  firebase.initializeApp(config);
</script>


{
  "rules": {
    ".read": true,
    ".write": true
  }
}
================================
<script src="https://www.gstatic.com/firebasejs/3.6.5/firebase.js"></script>
<script language="javascript" src="jquery-3.1.1.min.js"></script>
<script language="javascript">
$(document).ready(function()
{
// Initialize Firebase
  var config = {
    apiKey: "AIzaSyBANZv2bjoifiFmAJKpSwltchZjPA7bqnY",
    authDomain: "myhope615.firebaseapp.com",
    databaseURL: "https://myhope615.firebaseio.com",
    storageBucket: "myhope615.appspot.com",
    messagingSenderId: "285542370758"
    };
  firebase.initializeApp(config);
//讀取雲端資料 var db=firebase.database(); db.ref("name/").on("value",function(snap) { var data=snap.val(); alert(data); },function(error) { alert("資料存取失敗"); });

})

</script>
=========================
1.建立雲端資料庫元件
var db=firebase.database();
             name/
db.ref("節點").on("value",function(snap)
          選擇器  事件 值     成功
{

}
,function(error){
                失敗
});
===========================