do not refresh page on form submit code example

Example 1: how to make form not reload page

<form onsubmit="return false">
</form>

Example 2: submit() refreshes the page

<form onsubmit="return false;">Form stuff in here</form>

Example 3: why does my page reloads on form submission

//jquery method //
//preventDefault() prevents the submit button
//from performing its default task like page reload  
  $('#form').submit(function (e) {
      e.preventDefault();
  });

Example 4: make submit button not refresh page

If possible, change it to a normal button