Nginx允许跨域

if ($request_method = 'OPTIONS') { 
        add_header Access-Control-Allow-Origin *; 
        add_header Access-Control-Allow-Credentials true; 
        add_header Access-Control-Allow-Methods 'GET, POST, OPTIONS'; 
        add_header 'Access-Control-Allow-Headers' 'DNT,X-Mx-ReqToken,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type'; 
        return 200; 
    } 
     if ($request_method = 'POST') {
        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-Mx-ReqToken,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type';
     }

     if ($request_method = 'GET') {
        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-Mx-ReqToken,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type';
     }
     
     ################################
     if ($request_method = 'OPTIONS') { 
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-Mx-ReqToken,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type'; 
return 200; 
}

if ($request_method = 'POST') {
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-Mx-ReqToken,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type';
}

if ($request_method = 'GET') {
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-Mx-ReqToken,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type';
}