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                            [Web SQL Database](http://dev.w3.org/html5/webdatabase/)和[IndexedDB](http://www.w3.org/TR/IndexedDB/)讓瀏覽器有了數據庫存儲能力.很多應用場景可以遷移到客戶端數據庫以減少服務器的請求次數.

`localStorage`和`sessionStorage`在簡單數據存儲時比客戶端數據庫更快,可以用來實現一些簡單的狀態,進度保存.

當一個組件需要管理上百條數據(如好友列表),同時支持用戶搜索, 過濾, 排序時, 客戶端數據庫存儲一份數據可以有效減少HTTP請求次數. 查看[Web SQL Database tutorial](http://www.html5rocks.com/tutorials/webdatabase/todo/)獲取詳細指導.
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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