javascript, scope, function

<script type="text/javascript">
   var global_function = null;   <= 宣告在這裡才是global的        
       (function($){              
           function local_funtion() {    <= 這裡只是 local的 
           }
           global_funcion = function() {    <= 指定變數  成function     
           }     
        })(jQuery);
</script>
<script type="text/javascript">  
     global_function();       <=  global這裡才叫的到 
</script>