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                 function gotFileEntry(fileEntry) { 
                     fileEntry.createWriter(gotFileWriter, fail); 
                 } 

                 function gotFileWriter(writer) { 
                     writer.onwriteend = function(evt) { 
                         console.log("contents of file now 'some sample text'"); 
                         writer.truncate(11); 
                         writer.onwriteend = function(evt) { 
                             console.log("contents of file now 'some sample'"); 
                             writer.seek(4); 
                             writer.write(" different text"); 
                             writer.onwriteend = function(evt) { 
                                 console.log("contents of file now 'some different text'"); 
                             } 
                         }; 
                     }; 
                     writer.write("some sample text"); 
                 } 

                 function fail(error) { 
                     console.log(error.code); 
                 } 

                     window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, gotFS, fail);/preIt works if you install app on device (we tested it). It shouldn't work in browser because it's PhoneGap feature.