JS获取鼠标坐标位置实例分析

var EventUtil = {
  addHandler:function(elem,type,handler){
    if(elem.addEventListener)
    {
      elem.addEventListener(type,handler,false);
    }else if(elem.attachEvent)
    {
      elem.attachEvent("on"+type,handler);
    }else
    {
      elem["on"+type]=handler;
    }
  },
  removeHandler:function(elem,type,handler){
    if(elem.removeEventListener)
    {
      elem.removeEventListener(type,handler,false);
    }else if(elem.detachEvent)
    {
      elem.detachEvent("on"+type,handler);
    }else
    {
      elem["on"+type]=null;
    }
  },
  getEvent:function(event){
    return event?event:window.event;
  },
  getTarget:function(event){
    return event.target||event.srcElement;
  },
  preventDefault:function(event){
    if(event,preventDefault){
      event.preventDefault();
    }else{
      event.returnValue = false;
    }
  },
  stopPropagation:function(event){
    if(event.stopPropagation){
      event.stopPropagation();
    }else{
      event.cancelBubble=true;
    }
  }
};

var div = document.getElementById("myDiv");
EventUtil.addHandler(div,"click",function(event){
   event = EventUtil.getEvent(event);
   alert("Client coordinages: "+event.clientX+","+event.clientY);
});

var div = document.getElementById("myDiv");
EventUtil.addHandler(div,"click",function(event){
   event = EventUtil.getEvent(event);
   alert("Screen coordinates: "+event.screenX+","+event.screenY);
});

var div = document.getElementById("myDiv");
EventUtil(div,"click",function(event){
   event = EventUtil.getEvent(event);
   var pageX = event.pageX;
   var pageY = event.pageY;
   if(pageX==undefined)
  {
     pageX=event.clientX+document.body.scrollLeft||document.documentElement.scrollLeft;
  }
   if(pageY==undefined)
   {
     pageY = event.clientY+document.body.scrollTop||document.documentElement.scrollTop;
   }
   alert("Page coordinates: "+pageX+","+pageY);
});