onKeyUp event is not working in IE but works in firefox

I m trying to get what user type in text box with javascript so i used this

HTML:

JAVASCRIPT: function textTrack(e) { 开发者_StackOverflow中文版 alert(e.keyCode); }

this works fine in firefox but not in IE.

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In MSIE use the global event-object:

alert(window.event.keyCode);