LockedFile.truncate() - Web APIs 编辑

Non-standard

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.

Summary

The 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 LockedFile.location.

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 LockedFile.location.

Syntax

var request = instanceOfLockedFile.truncate(start);

Parameters

start Optional

A number representing the index where to start the operation.

Return

A FileRequest object to handle the success or failure of the operation.

Specifications

See also

• LockedFile