You can use like this:
$('input[type="button"][value="btn"]').on('click',function (e) {
If you need both separate them by a coma:
$('a[href^="#"], input[type="button"][value="btn"]').on('click',function (e) {
But I would strongly recommend to use a common class for them and access like this:
$('.common_class').on('click',function (e) {