fs.read(fd, buffer[, options], callback)

• fd <integer>
• buffer <Buffer> | <TypedArray> | <DataView> 数据将写入的缓冲区。
• options <Object>
  • offset <integer> 默认值: 0
  • length <integer> 默认值: buffer.byteLength - offset
  • position <integer> | <bigint> 默认值: null
• callback <Function>
  • err <Error>
  • bytesRead <integer>
  • buffer <Buffer>

与 fs.read() 函数类似，此版本采用可选的 options 对象。 如果未指定 options 对象，则默认使用上述值。

• fd <integer>
• buffer <Buffer> | <TypedArray> | <DataView> The buffer that the data will be written to.
• options <Object>
  • offset <integer> Default: 0
  • length <integer> Default: buffer.byteLength - offset
  • position <integer> | <bigint> Default: null
• callback <Function>
  • err <Error>
  • bytesRead <integer>
  • buffer <Buffer>

Similar to the fs.read() function, this version takes an optional options object. If no options object is specified, it will default with the above values.