title: HTML how to clear input using javascript?
body: <p>I have this INPUT, it will clear everytime we click inside of it.</p>
  
  <p>The problem:
  I want to clear only if value = exemplo@exemplo.com</p>
  
  <pre><code>&lt;script type="text/javascript"&gt;
      function clearThis(target) {
          target.value= "";
      }
  &lt;/script&gt;
  &lt;input type="text" name="email" value="exemplo@exemplo.com" size="30" onfocus="clearThis(this)"&gt;
  </code></pre>
  
  <p>Can someone help me to do this?
  I don't know how to compare, I already tried but no success.</p>