Go to file(if you load each module separately)
foundation.alert.js
line 23
$(this.scope).off('.alert').on('click.fndtn.alert', '[' + this.attr_name() + '] a.close', function (e) {
you make it like that
$(this.scope).off('.alert').on('click.fndtn.alert', '[' + this.attr_name() + '] a.close, .any-class-name', function (e) {