Get mouse position within div?

Possible Duplicate:
Mouse position relative to div
getting mouse position with javascript within canvas

How can I get the position of the mouse within a canvas that is a fixed size but has an automatic margin?

I can't make its position fixed and can't just use the regular mouse position on the page.

This code works perfectly:

mouseX = e.pageX - div.offsetLeft;
mouseY = e.pageY - div.offsetTop;

使用jQuery:

var divPos = {};
var offset = $("#divid").offset();
$(document).mousemove(function(e){
    divPos = {
        left: e.pageX - offset.left,
        top: e.pageY - offset.top
    };
});

使用event.layerXevent.layerY来获取鼠标相对于当前元素的位置:

$('#canvas').mousemove(function(e){
  var mousePos = {'x': e.layerX, 'y': e.layerY};
});

Taken from jQuery site: Jquery Tutorial site

$(document).mousemove(function(e){
      $('#status').html(e.pageX +', '+ e.pageY);
   }); 

NOTE: fixed syntax

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