Array应用，对象应用

private  var desction:Array = [0,0,0,0];
         private  function onKeyDownHandler(_evt:KeyboardEvent):void {
             switch (_evt.keyCode) {
                 case 37:
                    desction[0] = 1;
                     break;
                 case 38:
                    desction[1] = 1;
                     break;
                 case 39:
                    desction[2] = 1;
                     break;
                 case 40:
                    desction[3] = 1;
                     break;
                 default:
                     break;
            }
             // txt.text = desction.toString();
            trace("值：" + desction.toString())
            downTest(desction.join(""));
        }
         private  function downTest(k: String):void {
             switch (k) {
                     case "0110":
                        txt.text = "  上+右";
                         break;
                     case "1100":
                        txt.text = "  上+左";
                         break;
                     case "0011":
                        txt.text = "  下+右";
                         break;
                     case "1001":
                        txt.text = "  下+左";
                         break;
                     case "1010":
                        txt.text = "  左+右";
                         break;
                     case "0101":
                        txt.text = "  上+下";
                         break;
                     case "1000":
                        txt.text = "  左";
                         break;
                     case "0100":
                        txt.text = "  上";
                         break;
                     case "0010":
                        txt.text = "  右";
                         break;
                     case "0001":
                        txt.text = "  下";
                         break;
                     default:
                         break;
                }
        }
         private  function onKeyUpHandler(_evt:KeyboardEvent):void {
             switch (_evt.keyCode) {
                 case 37:
                    desction[0] = 0;
                     break;
                 case 38:
                    desction[1] = 0;
                     break;
                 case 39:
                    desction[2] = 0;
                     break;
                 case 40:
                    desction[3] = 0;
                     break;
                 default:
                     break;
            }
        }

 

 对象应用:

var key_obj:Object = new Object();

private  function onKeyDownHandler1(_evt:KeyboardEvent):void {
             var _code: String =  String.fromCharCode(_evt.charCode);
            key_obj[_code] =  true;
            
             for ( var p: String  in key_obj){  // 用于其它字母和数字鍵
                trace("当前按下的键有：" + p + "值=true(key_obj[p])");
            }
             /* _evt.ctrlKey && trace("Ctrl键被按下");
               _evt.altKey && trace("Alt键被按下");
             _evt.shiftKey && trace("Shift键被按下"); */
        }

         private  function onKeyUpHandler1(_evt:KeyboardEvent):void {
             var _code: String =  String.fromCharCode(_evt.charCode);
            
            key_obj[_code] =  null;
             delete key_obj[_code];
        }