How to use JavaScript to change the form action

My current code is as follows:

<div class="fr_search">   
  <form action="/"  accept-charset="UTF-8" method="post" id="search-theme-form">
  .......
  </form>
</div>

Now I want to write a function to change the form action and method, when a condition is met. How do I write this code?

For example,

function test() {
   if (selectedIndex === 1)....
} // How do I write this code?

javascript html forms

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