We can easily add our custom script in woocomerce checkout page by adding the following fuction in function.php of active theme folder
function add_checkout_script() { ?>
<script type="text/javascript">
jQuery(document).on( "updated_checkout", function(){
$("#divId").click(function () {
alert('ok');
});
});
</script>
<?php
}
add_action( 'woocommerce_after_checkout_form', 'add_checkout_script' );