javascript - firebase.database.ref is not a function error

Question

I am trying to read/write data from my database, but I always get this error:

firebase.database.ref is not a function error

Here is how I have included firebase into a project:

<script src="https://www.gstatic.com/firebasejs/5.9.3/firebase-app.js"></script>
<script src="https://www.gstatic.com/firebasejs/5.9.3/firebase-auth.js"></script>
<script src="https://www.gstatic.com/firebasejs/5.9.3/firebase-database.js"></script>

then:

<script>
var config = {
    ...
};

firebase.initializeApp(config);
</script>

The Firebase Auth works correctly. But when I do this:

function insertUser(user,name) {


     var ref = firebase.database.ref();

        ref.collection("users").doc(user.uid).set({
         uid: user.uid,
         email: user.email,
         name: name

         })
    .then(function() {
      console.log("Document successfully written!");
    })
    .catch(function(error) {
        console.error("Error writing document: ", error);
    });

}

I get error above. What am I doing wrong?

Answer 1

Waitting for answers