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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
</head>
<body>
<!-- The core Firebase JS SDK is always required and must be listed first -->
<script src="https://www.gstatic.com/firebasejs/8.1.1/firebase-app.js"></script>
<script src="https://www.gstatic.com/firebasejs/8.1.1/firebase-database.js"></script>
<!-- TODO: Add SDKs for Firebase products that you want to use
https://firebase.google.com/docs/web/setup#available-libraries -->
<script>
// Your web app's Firebase configuration
var firebaseConfig = {
// YourCode
};
// Initialize Firebase
firebase.initializeApp(firebaseConfig);
// Add data
let obj = {
name: "TF3",
age: 25,
};
firebase.database().ref("users/user3").set(obj);
// // read data
firebase
.database()
.ref("users/user1")
.on("value", (sanpshot) => {
console.log(sanpshot.val());
});
// update data
let newupdateddata = {
name: "TF0",
};
firebase.database().ref("users/user3").update(newupdateddata);
// remove data
firebase.database().ref("users/user3").remove();
</script>
</body>
</html>