The difference between root and alias of nginx location

Today I finally figured out the role of root and alias in location configuration, and the difference between them is clear at a glance!

location /img/<span> {
    alias </span>/var/www/image/<span>;
}
#若按照上述配置的话，则访问/img/目录里面的文件时，ningx会自动去/var/www/image/目录找文件</span>

location /img/ {
    root /var/www/image;
}
#若按照这种配置的话，则访问/img/目录下的文件时，nginx会去/var/www/image/img/目录下找文件。] 

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

I always thought that root refers to the /var/www/image directory, which should be /var/www/image/img/

Another important difference is that the alias must end with "/", otherwise it will The file cannot be found. . . Root is optional~~

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The above has introduced the difference between root and alias of nginx location, including the relevant aspects. I hope it will be helpful to friends who are interested in PHP tutorials.