Javascript 注册MouseMove:事件对象始终未定义

我有一个注册鼠标移动事件的Javascript对象。但我的问题是，事件参数没有在自定义函数中传递，它总是未定义的

如果查看下面的函数touchMove（），您会发现由于某些原因，参数事件始终未定义？

我做错了什么

MyObject.prototype.registerPointerEvents = function()  
{
  var instance = this;  // function() { instance.func(); }
  var ele      = this.getAttrib("divEle");

  ele.addEventListener("mousemove", function() { instance.touchMove(); }, false); 
}

MyObject.prototype.touchMove = function( /*Event*/ event )
{
  // Virtual function to be overridden in child classes

  console.log("MOVE 1: "+event); // here it outputs event is undefined
  if (!event)
     event = window.event;

  console.log("MOVE 2: "+event); // here event is still undefined
  if (this.getAttrib("isDragging") == "true")
  {
     console.log("MOVE TRUE");
     this.getAttrib("divEle").style.left = event.clientX+"px";
     this.getAttrib("divEle").style.top  = event.clientY+"px";
  }
}

---

当然是未定义的，您正在调用一个没有参数的匿名函数

最好使用这个：

ele.addEventListener("mousemove", instance.touchMove, false);

这（几乎）和

ele.addEventListener("mousemove", function(e) { instance.touchMove(e); }, false);