fs.writev(fd, buffers[, position], callback)

使用 writev()ArrayBufferView 数组写入 fd 指定的文件。

position 是该数据应写入的文件开头的偏移量。 如果 typeof position !== 'number',则数据将写入当前位置。

回调将被赋予三个参数:errbytesWrittenbuffersbytesWritten 是从 buffers 写入的字节数。

在同一个文件上多次使用 fs.writev() 而不等待回调是不安全的。 对于这种情况,请使用 fs.createWriteStream()

在 Linux 上,以追加模式打开文件时,位置写入不起作用。 内核会忽略位置参数,并始终将数据追加到文件末尾。

Write an array of ArrayBufferViews to the file specified by fd using writev().

position is the offset from the beginning of the file where this data should be written. If typeof position !== 'number', the data will be written at the current position.

The callback will be given three arguments: err, bytesWritten, and buffers. bytesWritten is how many bytes were written from buffers.

If this method is util.promisify()ed, it returns a Promise for an Object with bytesWritten and buffers properties.

It is unsafe to use fs.writev() multiple times on the same file without waiting for the callback. For this scenario, use fs.createWriteStream().

On Linux, positional writes don't work when the file is opened in append mode. The kernel ignores the position argument and always appends the data to the end of the file.