Nginx's root command

It's been a long time. Nginx Root Path:

location/img/{
    alias/var/www/image/;
}
#若按照上述配置的话, NINGX will automatically go to/var/www/image/directory to find files when accessing the files in the/img/directory.

location/img/{
    root/var/www/image;
}

The alias is a definition of a directory alias, and Root is the definition of the top-level directory.

Always thought Root was referring to the/var/www/image directory, which should be/var/www/image/img/

Another important difference is that the alias must be followed by the "/" end, or you will not find the file ... and Root is dispensable ~ ~