<script>
function c2(obj)
{
alert(obj);
}
function cleart()
{
var btn = document.getElementById('btn');
btn.detachEvent("onclick",cc);
}
function setevent()
{
var btn = document.getElementById('btn');
var fn = "c2('dddd')";
btn.attachEvent("onclick",cc=function(){eval(fn);});
}
</script>
<input type="button" />
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