我尝试了几种方法，但没有工作。我链接如下：

<script src="https://www.gstatic.com/firebasejs/ui/6.0.1/firebase-ui-auth.js"></script>
<link type="text/css" rel="stylesheet" href="https://www.gstatic.com/firebasejs/ui/6.0.1/firebase-ui-auth.css" />

这是火力点配置：

<script type="module">
      import { initializeApp } from "https://www.gstatic.com/firebasejs/9.15.0/firebase-app.js";
      import { getAnalytics } from "https://www.gstatic.com/firebasejs/9.15.0/firebase-analytics.js";
      import { getFirestore } from "https://www.gstatic.com/firebasejs/9.15.0/firebase-firestore.js";
      const firebaseConfig = {
      // some config
      };

      const app = initializeApp(firebaseConfig);
            const analytics = getAnalytics(app);
            const db = getFirestore(app);
      async function getCities(db) {
        const citiesCol = collection(db, 'cities');
        const citySnapshot = await getDocs(citiesCol);
        const cityList = citySnapshot.docs.map(doc => doc.data());
        return cityList;
      }
      </script>

配置到身份验证：

<script>
          var uiConfig = {
            signInSuccessUrl: 'localhost:5500',
            signInOptions: [
            {
              provider: firebase.auth.EmailAuthProvider.PROVIDER_ID,
              signInMethod: firebase.auth.EmailAuthProvider.EMAIL_LINK_SIGN_IN_METHOD
            }
            ],
            tosUrl: 'localhost:5500',
            privacyPolicyUrl: function() {
              window.location.assign('localhost:5500');
            }
          };
          var ui = new firebaseui.auth.AuthUI(firebase.auth());
          ui.start('#firebaseui-auth-container', uiConfig);
        </script>

问题是**未捕获引用错误：未定义firebase。**适用于：

provider: firebase.auth.EmailAuthProvider.PROVIDER_ID,

我试图通过Firebase连接授权到我的网站。如何解决这个问题？请帮助。