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.
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要把数据从文件里读出来写入buffer，offset也是buffer的偏移量
(Nodejs) writes the data to
buffer. The writing starts atoffset.Nodejs does read out the data from
fdtobuffer, but the reading starts at the offset that the operating system associated withfd.If you read something, that thing is the source of some data, not data itself. Read a file, read an article, etc.