nginx怎么设置404页面啊？求教

参考官方提供的文档： http://wiki.nginx.org/HttpCoreModule#error_page

error_page
Syntax:    error_page code ... [ = [ response ]] uri
Default:    
Context:     http
server
location
if in location
Reference:    error_page

The directive specifies the URI that will be shown for the errors indicated.

Example:

error_page   404          /404.html;
error_page   502 503 504  /50x.html;
error_page   403           http://example.com/forbidden.html;
error_page   404          = @fetch;
Furthermore, it is possible to change the status code of the answer to another, for example:

error_page 404 =200 /empty.gif;
error_page 404 =403 /forbidden.gif;
Additionally you can have your designated error handler determine the returned status code by using = without specifying a status code.

error_page   404 = /404.php;
If there is no need to change URI during redirection it is possible to redirect processing of error pages into a named location:

location / (
    error_page 404 @fallback;
)

location @fallback (
    proxy_pass http://backend;
)

我也不太懂