js取鼠标坐标位置

取鼠标坐标位置有这些：鼠标在视口的坐标位置(clientX,clientY),鼠标在页面的坐标位置(pageX,pageY),鼠标在屏幕的坐标位置(screenX,screenY)，其中鼠标在视口的坐标位置(clientX,clientY),以及鼠标在屏幕的坐标位置(screenX,screenY)在所有的浏览器中都支持，但是鼠标在页面的坐标位置(pageX,pageY)在IE8及更早版本不支持，但是没有关系，可以通过scrollLeft 和 scrollTop可以计算出pageX,pageY的值。

首先是跨浏览器的事件对象

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;
        }
    }
    
};

1.视口坐标位置

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

2.屏幕坐标位置

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

3.页面坐标位置

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);
});