Deprecated:
This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the
compatibility table
at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.
The
readAsBinaryString()
method of the
FileReader
interface is used to start reading the contents of the
specified
Blob
or
File
. When the read operation is
finished, the
readyState
property becomes
DONE
, and the
loadend
event is triggered. At that time, the
result
property contains the raw binary data from
the file.
Note that this method was once removed from the File API specification, but
re-introduced for backward compatibility.
Using
FileReader.readAsArrayBuffer()
is recommended.