JavaScript keyboard mobile div practice

        
        
         
        = Function (Event) {
             // upper left lower right corresponds to the encoding 37-40 
            Switch (event.keyCode) {
                 Case 37 [ :
 //                     Alert ( "left"); 
                    d01.style.left = d01.offsetLeft-10 + "PX " ; 
                    Berak; 
                Case 38 is :
 //                     Alert (" upward "); 
                    d01.style.top = d01.offsetTop-10 +" PX " ; 
                    Berak; 
                Case 39 :
 //                     Alert (" right "); 
                    d01.style = + 10 + d01.offsetLeft .left "PX" ; "
                    he;
                case 40:
//                    alert("向下");
                    d01.style.top=d01.offsetTop+10+"px";
                    berak;
                
            }
        }
    </script>
</html>