Change Class of input element with using id

2018-06-08 07:44:25

Possible Duplicate:
Change an element's CSS class with JavaScript

How can I change the class of <input type="submit:> not using the id, just the class in Javascript. I have have tried this (with no luck):

function changeClass(){
    document.getElementById("wpsc_buy_button").setAttribute("class", "btn btn-success");
}

$('.originalClass').addClass('newClass')

Why would this not work?

you can also do

$('.originalClass').addClass('newClass').removeClass('originalClass');

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