Firebase Auth（javascript）：链接帐户时出现“TypeError：user.delete 不是函数”

Question

我正在尝试将匿名 firebase 帐户与提供者帐户相关联，并且我正在使用从此处的文档中复制的以下 javascript 代码：https://firebase.google.com/docs/auth/web/account-linking

这是我正在使用的确切代码：

function mergeAccounts(credential){

    console.log("merging guest account with provider account");

    var auth = firebase.auth();

    // Get reference to the currently signed-in user
    var prevUser = auth.currentUser;
    // Sign in user with another account
    auth.signInAndRetrieveDataWithCredential(credential).then(function(user) {
      console.log("Sign In Success", user);
      var currentUser = user;
      // Merge prevUser and currentUser data stored in Firebase.
      // Note: How you handle this is specific to your application

      // After data is migrated delete the duplicate user
      return user.delete().then(function() {
        // Link the OAuth Credential to original account
        return prevUser.linkAndRetrieveDataWithCredential(credential);
      }).then(function() {
        // Sign in with the newly linked credential
        return auth.signInAndRetrieveDataWithCredential(credential);
      });
    }).catch(function(error) {
      console.log("Sign In Error", error);
    });
}

当我以匿名用户身份登录到 firebase，然后尝试使用我的 google 帐户登录时，上面的代码成功地用 google 登录了我（console.log("Sign In Success", user); 行按预期工作，并向我显示了用户详细信息控制台。但是我得到一个错误，上面写着Sign In Error TypeError: user.delete is not a function at 16login.js:212，它指的是具有return user.delete().then(function() {的行

我使用的文档和代码 sn-p 似乎表明 delete() 是 user 的一个函数，所以我对它为什么会抛出这个错误感到有点困惑。

非常感谢任何帮助 - 谢谢。

Answer 1

您使用的是signInAndRetrieveDataWithCredential 方法，而不是signInWithCredential，因此返回值为UserCredential 对象。您需要通过回调函数的返回属性的user 属性访问user：

    auth.signInAndRetrieveDataWithCredential(credential).then(function(userCredential) {
          const user = userCredential.user; // HERE
          console.log("Sign In Success", user);
          var currentUser = user;
          // Merge prevUser and currentUser data stored in Firebase.
          // Note: How you handle this is specific to your application

          // After data is migrated delete the duplicate user
          return user.delete().then(function() {
            // Link the OAuth Credential to original account
            return prevUser.linkAndRetrieveDataWithCredential(credential);
          }).then(function() {
            // Sign in with the newly linked credential
            return auth.signInAndRetrieveDataWithCredential(credential);
          });
        }).catch(function(error) {
          console.log("Sign In Error", error);
        });