filehandle.read(buffer[, options])


    从文件中读取数据,并将其存储在给定的缓冲区中。

    • buffer <Buffer> | <TypedArray> | <DataView> A buffer that will be filled with the file data read.
    • options <Object>
      • offset <integer> The location in the buffer at which to start filling. Default: 0
      • length <integer> The number of bytes to read. Default: buffer.byteLength - offset
      • position <integer> The location where to begin reading data from the file. If null, data will be read from the current file position, and the position will be updated. If position is an integer, the current file position will remain unchanged. Default:: null
    • Returns: <Promise> Fulfills upon success with an object with two properties:

    Reads data from the file and stores that in the given buffer.

    If the file is not modified concurrently, the end-of-file is reached when the number of bytes read is zero.