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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
  <input type="button" value="1">
  <input type="button" value="2">
  <input type="button" value="3">
  <script>
    var btnList = document.getElementsByTagName('input');
    var len = btnList.length;
    for(var i=0;i<len;i++){
      btnList[i].onclick = function(){
        alert(i);
      }
    }
  </script>
</body>
</html>
Output

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xw5pro
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