This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
truncate method is used to remove some data within the file.
If the method is called with no argument, the operation removes all the bytes starting
at the index set in
If the method is called with an argument, the operation removes all the bytes starting
at the index corresponding to the parameter and regardless of the value of
var request = instanceOfLockedFile.truncate(start);
- A number representing the index where to start the operation.
FileRequest object to handle the success or failure of the operation.
|FileSystem API||Editor's Draft||Draft proposal|