XOR checkbox checked state toggler

gistfile1.html

<input type="checkbox"><button>Clique para alternar estado do checkbox</button>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script>
$('button').click(function() {
    $('input')[0].checked ^= 1;
});
</script>