page_op.html

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <link rel="stylesheet" type="text/css" href="http://localhost/style.css">
</head>
<body id="target">
  <header>
    <h1><a href="http://localhost/">JavaScript</a></h1>
  </header>
  <nav>
    <ul>
      <li><a href="http://localhost/page_html.html">JavaScript란?</a></li>
      <li><a href="http://localhost/page_vc.html">변수와 상수</a></li>
      <li><a href="http://localhost/page_op.html">연산자</a></li>
    </ul>
  </nav>
  <div id="control">
    <input type="button" value="white" onclick="document.getElementById('target').className='white'" />
    <input type="button" value="black" onclick="document.getElementById('target').className='black'"  />
  </div>
  <article>
    <h2>연산자</h2>
    계산을 할 때 사용되는 것입니다.
  </article>
</body>
</html>