how do i make a hash run a function

window.location.hash = "#ca"
{
    function changeText(1);
    function changeText(2)
}

is syntactically invalid JavaScript, so the assignment to location.hash never happens.

I'm not quote clear on what you're trying to do, but maybe

    function changeText(1);
    function changeText(2)

should be

    changeText(1);
    changeText(2);

Changing the hash does not cause the page to reload, so the server isn't involved. You can always use JavaScript to examine the hash and behave differently based on it.