Peter Foti :
> function addEvent( obj, type, fn ) {
> if ( obj.attachEvent ) {
> obj['e'+type+fn] = fn;
> obj[type+fn] = function(){obj['e'+type+fn]( window.event );}
> obj.attachEvent( 'on'+type, obj[type+fn] );
> }
This is perfectly example of how you can setup circular reference
pattern, which cause memory leak in older IE.
Variable Object of addEvent -> obj -> obj[type+fn] ->
function[[Scope]] -> Variable Object of addEvent
You cannot prevent this leak. The only one unreliable way is to setup
unload handler which breaks this circular reference.
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