网站A通过jqeury要求网站B的api接口时，会提示跨域问题，这时候有2种跨域处理。

一是：做事器端设置跨域问题，比如后端是php开拓

header("Access-Control-Allow-Origin: ");header("Access-Control-Allow-Headers: Origin, X-Requested-With, Content-Type, Accept, X-Token");header("Access-Control-Allow-Methods: GET, POST, PUT,DELETE,OPTIONS,PATCH");header("Access-Control-Allow-Credentials: true");

二是：在nginx设置跨域问题配置。
即本文重点先容的方法

跨域设置phpNginx跨域设置装备摆设 Node.js

在nginx.conf文件http里配置

add_header Access-Control-Allow-Origin ; add_header Access-Control-Allow-Credentials true; add_header Access-Control-Allow-Methods GET,POST,OPTIONS; add_header Access-Control-Allow-Headers DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type;

2、在(有多个项目配置的)详细的项目配置里location /里配置

if ($request_method = 'OPTIONS') { add_header Access-Control-Allow-Origin ; add_header Access-Control-Allow-Methods GET,POST,OPTIONS; add_header Access-Control-Allow-Credentials true; add_header Access-Control-Allow-Headers DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type; return 204;}末了，欢迎大家留言补充，谈论~~~