FileReaderSync - Web APIs 编辑

The FileReaderSync interface allows to read File or Blob objects synchronously.

Note:

This interface is only available in workers as it enables synchronous I/O that could potentially block.

Properties

This interface does not have any properties.

Methods

FileReaderSync.readAsArrayBuffer()

This method converts a specified Blob or a File into an ArrayBuffer representing the input data as a binary string.

FileReaderSync.readAsBinaryString()

This method converts a specified Blob or a File into a DOMString representing the input data as a binary string. This method is deprecated, consider using readAsArrayBuffer() instead.

FileReaderSync.readAsText()

This method converts a specified Blob or a File into a DOMString representing the input data as a text string. The optional encoding parameter indicates the encoding to be used (e.g., iso-8859-1 or UTF-8). If not present, the method will apply a detection algorithm for it.

FileReaderSync.readAsDataURL()

This method converts a specified Blob or a File into a DOMString representing the input data as a data URL.

Specifications

Browser Compatibility

BCD tables only load in the browser

See also

• FileReader
• BlobBuilder, Blob
• File
• FileReader