javascript - Why it won't pass the string to input field but it shows in HTML? -

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when loads, can see key this
your key: shf8tg382kds
however, key won't appear in input field.
why? , how can solve this?

javascript part

<script>     window.onload = function(){         $(".chat#key").val($('#peer-id').text()).focus()     } </script>

html part

<p>your key : <span id="peer-id"></span> </p>  <input class="chat" id="key" name="messages[body]" placeholder="type key here!" type="text" />

update

if change this, shows abc in input field.

$(".chat#key").val('abc').focus()


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