jquery children()方法

<!DOCTYPE html>
<html>
<head>
<script type="text/javascript" src="/jquery/jquery.js"></script>
<style>
  body { font-size:16px; font-weight:bolder; }
  p { margin:5px 0; }
</style>
</head>
<body>
  <div>
    <span>Hello</span>
    <p class="selected">Hello Again</p>
    <div class="selected">And Again</div>

    <p>And One Last Time</p>
  </div>
<script>$("div").children(".selected").css("color", "blue");</script>
</body>
</html>