htaccess文件mod_rewrite问题

Basically this is my structure:

/
 - index.html
 - js files ( the ones making http requests to /api/

/api
 - api.php

Basicly what im trying to do is to map requests to localhost/api/ to go to localhost/api/api.php

I have tried with the following with no results:

RewriteEngine On
RewriteBase /api/
RewriteRule ^/?(api)/? /api/api.php [NC]
RewriteCond %{REQUEST_METHOD} (PUT|DELETE)
RewriteRule .* /api/api.php

Can anyone help me?

Summary: Right now when making http requests I have to set baseUrl to api/api.php/###

I want to to be reached through api/###