Firebase的FacebookAuthProvider.addScope有何功能？

Question

Firebase的FacebookAuthProvider.addScope有什麼功能？是否需要檢索訪問令牌？

Answer 1

這是用來添加的Facebook的OAuth 2.0範圍，如： 'public_profile'， '電子郵件'， 'user_likes'， 'user_friends' 等 例如：

var provider = new firebase.auth.FacebookAuthProvider(); 
provider.addScope('user_friends'); 
provider.addScope('user_likes'); 
// This will open the Facebook sign in page and ask user to consent 
// to the additional scopes. 
firebase.auth().signInWithPopup(provider).then(function(result) { 
    if (result.user) { 
    // Additional user info like Facebook account url, gender, etc. 
    console.log(result.additionalUserInfo.profile); 
    // Facebook access token returned in the process 
    // for the scopes requested. 
    console.log(result.credential.accessToken); 
    } 
});