在htaccess文件中AddHandler和AddType有什么区别

Can someone explain what the difference is between AddType and AddHandler in htaccess files? I want to make the settings such that I can have a javascript file (.js) be run through the server as though it were a php file (application/x-httpd-php5) but then sent to the user's browser as a (text/javascript) file. How might i configure this?Can someone explain what the difference is betw