Js FileReader Picture Loading

FileReader

FileReader is primarily used to read the contents of a file into memory, and through a series of asynchronous interfaces, local files can be accessed in the main thread.

Method

method Definition	Description
Abort (): void	Terminating file read operations
Readasarraybuffer (file): void	Asynchronously reads the contents of a file in bytes, and the result is represented by a Arraybuffer object
Readasbinarystring (file): void	Asynchronously reads the contents of a file by byte, resulting in a binary string of the file
Readasdataurl (file): void	Asynchronously reads the contents of a file, and the result is expressed as a string of Data:url
Readastext (file,encoding): void	Asynchronously reads the contents of a file by character, resulting in a string representation

Event

Event name	Description
Onabort	Called when the read operation is aborted
OnError	Called when a read operation has an error
OnLoad	Called when the read operation completes successfully
Onloadend	Called when a read operation is complete, whether successful or unsuccessful
Onloadstart	Called before the read operation will begin
OnProgress	Periodic calls during data read

Js FileReader Picture Loading