<head>
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<base target="_blank">
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<script src="https://code.jquery.com/jquery-1.11.3.js"></script>
<script>
$( document ).ready(function() {
$('a[href^="http://"]').not('a[href*=tcampus]').attr('target','_blank');
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<body>
<div id="aaa">
<a href="http://www.naver.com/">aaa</a>
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TAG base target