回答編集履歴
1
ミスがあったため修正。
    
        answer	
    CHANGED
    
    | @@ -2,7 +2,7 @@ | |
| 2 2 | 
             
            [https://firebase.google.com/docs/reference/js/firebase.database.Database?hl=ja](https://firebase.google.com/docs/reference/js/firebase.database.Database?hl=ja)
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| 3 3 |  | 
| 4 4 | 
             
            ```JavaScript
         | 
| 5 | 
            -
            firebase.database(). | 
| 5 | 
            +
            firebase.database().goOffline();
         | 
| 6 6 | 
             
            ```
         | 
| 7 7 |  | 
| 8 8 | 
             
            これとか?
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