jquery - Set the value of an input field? -


i have this:

<body>     <header></header>     <h1>request group rate</h1>      <form>         <input type="hidden" id="referrer">         //...     </form>      <script>         $(document).ready(function(){             $('input[id="referrer"]').val(document.referrer);         });     </script>

how set value attribute of <input> id="referrer"?

$(document).ready(function() {      $("input[id=referrer]").attr('value', document.referrer);  });
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>    <body>      <h1>request group rate</h1>      <form>          <input type="text" id="referrer" value="" style="width:100%">      </form>  </body>


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