用仿ActionScript的语法来编写html5——第七篇，自定义按钮

function gameInit(event){      backLayer = new LSprite();      addChild(backLayer);            btn01 = new LButton(new LBitmap(new LBitmapData(imglist["replay_button_up"])),new LBitmap(new LBitmapData(imglist["replay_button_over"])));      btn01.x = 76;      btn01.y = 50;      backLayer.addChild(btn01);            btn02 = new LButton(new LBitmap(new LBitmapData(imglist["quit_button_up"])),new LBitmap(new LBitmapData(imglist["quit_button_over"])));      btn02.x = 76;      btn02.y = 100;      backLayer.addChild(btn02);            btn01.addEventListener(LMouseEvent.MOUSE_DOWN, onmousedown01);      btn02.addEventListener(LMouseEvent.MOUSE_DOWN, onmousedown02);  }  function onmousedown01(event){      alert("btn01 on click");  }  function onmousedown02(event){      alert("btn02 on click");  }

function LButton(bitmap_up,bitmap_over){      base(this,LSprite,[]);      var self = this;      self.type = "LButton";      self.bitmap_up = bitmap_up;      self.addChild(bitmap_up);      if(bitmap_over == null){          bitmap_over = bitmap_up;      }else{          self.addChild(bitmap_over);      }      self.bitmap_over = bitmap_over;          self.bitmap_over.visible = false;      self.bitmap_up.visible = true;      LGlobal.buttonList.push(self);  }      LButton.prototype.buttonModeChange = function (){      var self = this;      var cood={x:0,y:0};      var parent = self.parent;      while(parent != "root"){          cood.x += parent.x;          cood.y += parent.y;          parent = parent.parent;      }      if(self.ismouseon(LGlobal.mouseMoveEvent,cood)){          self.bitmap_up.visible = false;          self.bitmap_over.visible = true;      }else{          self.bitmap_over.visible = false;          self.bitmap_up.visible = true;      }  }  LButton.prototype.die = function (){      var self = this;      arguments.callee.super.die.call(this);      for(var i=0;i<LGlobal.buttonList.length;i++){          if(LGlobal.buttonList[i].objectindex == self.objectindex){              LGlobal.buttonList.splice(i,1);              break;          }      }  }