Jquery. Convert String to number and add 1

This is what I tried to convert a string to a number and add 1:

<script>
var title = $("div.example");
var parts = title.split(' - ');
var parts2 = +parts[0];
var convert = parts2 + 1;
$("div.example").replace(parts2 , convert);
</script>

via Chebli Mohamed