确保HTML按钮不向服务器发送任何信息的最安全方法

I'm working on a javascript app that has a form with a button that processes inputs in the browser. It is important that the data never accidentally get sent to the server when the button is pushed. Situations where this might happen is the browser may not have javascript enabled or the DOM implementation may have a bug where the click binding on the button is lost briefly (I've seen this happen once in testing but not in a way that is reproducible).I'm working on a javascript app that has a form