Submit buttom is an HTML element. So, only javascript can be invoked with the submit button. Also, The Submit button with form automatically submits the page to server when clicked. You just have to specify action attribute for the form, no javascript code is needed here.
Yet, if you would like to add custom processing you can code either in pure javascript or jQuery.
ex:jquery event handler for submit button whose id=btnSubmit
<script type="text/javascript">
$(document).ready(function () {
$("#btnSubmit").click(function (e) {
alert("submit");
});
});
</script>