页面自动刷新?。

曾尝试在服务器和本地以及从文件中运行页面。

                <button class="uk-button uk-button-primary" id="sin">hello</button>
                <button class="uk-button uk-button-primary" id="sout">logout</button>
            </div>
        </fieldset>
    </form>
</div>
<script src="https://www.gstatic.com/firebasejs/7.2.3/firebase-app.js"></script>

<script src="https://www.gstatic.com/firebasejs/7.2.3/firebase-auth.js"></script>
<script>
    var firebaseConfig = {
        //this part does its job fine
    };

    // Initialize Firebase
    firebase.initializeApp(firebaseConfig);
    var sout = document.getElementById('sout');
    var sin = document.getElementById('sin');

    sin.addEventListener('click',() => {
        console.log("click1");
        let email = document.getElementById('email').value;
        let pass = document.getElementById('pass').value;
        firebase.auth().signInWithEmailAndPassword(email,pass).then(()=>{
            console.log("sucessfull");
        }).catch(function(error) {
      var errorCode = error.code;
      var errorMessage = error.message;
      if (errorCode === 'auth/wrong-password') {
        alert('Wrong password.');
      } else {
        alert(errorMessage);
      }
      console.log(errorMessage);
    });   
    });

    sout.addEventListener('click',() => {
        console.log("click1");
        firebase.auth().signOut().then(function () {
            console.log("Sign-out successful");
        }).catch(function (error) {
            console.log(error);
        });
    });
</script>

控制台日志必须保留，但不能保留。 尝试对每一行进行断点操作，似乎控制台日志可以正常工作，但是在页面末尾，它们消失了，重新加载浏览器。