fs.read(fd, buffer, offset, length, position, callback)
Read data from the file specified by fd.
buffer is the buffer that the data will be written to.
offset is the offset in the buffer to start writing at.
为什么不是这样：
buffer is the buffer that the data will be read to.
offset is the offset in the buffer to start reading at.
(Nodejs) writes the data to buffer. The writing starts at offset.
Nodejs does read out the data from fd to buffer, but the reading starts at the offset that the operating system associated with fd.
If you read something, that thing is the source of some data, not data itself. Read a file, read an article, etc.
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