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- firebase.database().ref('users/' + starUserData + '/userStar').once("value").then(function(count) {
- if ( /* ... */ ) {
- // ...
- return firebase.database().ref().update(updates)
- } else {
- // ...
- return firebase.database().ref().update(updates)
- }
- }).then(function() {
- // update 成功
- }, function(err) {
- // update 失敗
- })
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