alias與root區(qū)別

官方root

Sets the root directory for requests. For example, with the following configuration
location /i/ {
    root /data/w3;
}

The /data/w3/i/top.gif file will be sent in response to the “/i/top.gif” request
官方alias

Defines a replacement for the specified location. For example, with the following configuration
location /i/ {
    alias /data/w3/images/;
}

on request of “/i/top.gif”, the file /data/w3/images/top.gif will be sent.

當訪問/i/top.gif時，root是去/data/w3/i/top.gif請求文件，alias是去/data/w3/images/top.gif請求,也就是說
root響應的路徑：配置的路徑+完整訪問路徑(完整的location配置路徑+靜態(tài)文件)
alias響應的路徑：配置路徑+靜態(tài)文件(去除location中配置的路徑)