host and hostname are different things

host can contain the port (host of http://example.com:1234 is
example.com:1234) while hostname never contains a port. They can however
be similar. If you navigate to http://example.com then both host and
hostname will be example.com.

* Fixed docs
* added getHostName function

core/js/js.js

@@ -243,9 +243,15 @@ var OC={
 	},
 
 	/**
-	 * Returns the host name used to access this ownCloud instance
+	 * Returns the host used to access this ownCloud instance
+	 * Host is sometimes the same as the hostname but now always.
 	 *
-	 * @return {string} host name
+	 * Examples:
+	 * http://example.com => example.com
+	 * https://example.com => exmaple.com
+	 * http://example.com:8080 => example.com:8080
+	 *
+	 * @return {string} host
 	 *
 	 * @since 8.2
 	 */
@@ -253,6 +259,17 @@ var OC={
 		return window.location.host;
 	},
 
+	/**
+	 * Returns the hostname used to access this ownCloud instance
+	 * The hostname is always stripped of the port
+	 *
+	 * @return {string} hostname
+	 * @since 9.0
+	 */
+	getHostName: function() {
+		return window.location.hostname;
+	},
+
 	/**
 	 * Returns the port number used to access this ownCloud instance
 	 *