javascript jquery add stylesheet if class is present -

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can tell me why following doesn't work in 'head'

<script type="text/javascript">  if ($('.company-color').length){     document.write("<link rel='stylesheet' href='company-color.css' type='text/css'>"); }  </script>

i have class present on pages , want insert above stylesheet page if class '.company-color' present.

use

jquery(function($){     if ($('.company-color').length){         $('body').append("<link rel='stylesheet' href='company-color.css' type='text/css'>"); // or head     } })

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