javascript - Get value from button in while loop -

i've got while loop multiple buttons, this:

<button onclick="confirmdelete()" value="<?php echo $game['id'];?>" name="deletebutton">delete </button>  

it followed following confirm message:

<script> function confirmdelete() {  var r = confirm(" **here want id start with** "); if (r == true) {     // delete } else {     // cancel } } </script> 

each button has own value, want value in javascript when click on button. tried multiple things cant make work.

edit:

if can tell me better/easier way this, you're welcome tell me

use function this argument, i.e.:

<button onclick="confirmdelete(this)" id="mybutton" value="someid" name="deletebutton">delete </button>  <script> function confirmdelete(elem) { var r = confirm(" **here want id start with** "); var thevalue = elem.value; //someid var theid    = elem.id; //mybutton if (thevalue == "true") {     alert("true") } else {     alert("false") } } </script> 

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live demo:
http://codepen.io/anon/pen/qyzgqo