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$('#checkbox').click(function(){
var checked = $('input:checked').val();
if(checked){
//do something
a=1;
}else{
//do something
a=2;
}
});
<input type="checkbox" id="checkbox"/>
<script src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.4.4.min.js"></script>
<script type="text/javascript">
$('#checkbox').click(function(){
var a;
var checked = $('input:checked').val();
if(checked){
//do something
a=1;
}else{
//do something
a=2;
}
alert(a);
});
</script>