Application.Quit
static function Quit(): void;
Description

Quits the player application. Quit is ignored in the editor or the web player.

IMPORTANT: In most cases termination of application under iOS should be left at the user discretion. Consult Apple's Technical Q&A qa1561 page for further details: http://developer.apple.comiphonelibraryqaqa2008/qa1561.html.
	// Quits the player when the user hits escape
	function Update () {
		if (Input.GetKey ("escape")) {
			Application.Quit();
		}
	}