javascript - On button click run function that add stuff to body -

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sorry noobish question, new html/javascript. lets have from:

<form id="pass" >         <p>             password: <input type="password" name="password" >             username: <input type="text" name="username" value="user">              <input type="submit" value="send" class=btn> <input type="reset" class=btn>         </p>     </form>

and when button pressed. want run function in script.js file, example clear body.

what right way it?

many thanks!

add code in form tag onsubmit="javascript: function_name();" example:

<form name="name" id="name" onsubmit="javascript: function_name();">     // code </form>

now in js, write:

<script> function function_name() {     alert("hi"); } </script>

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