下面的例子改变一个段落的 HTML 样式 - 在线编辑器

          <!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
</head>
<body>

  <p id="p1">Hello world!</p>
  <p id="p2">Hello world!</p>

  <script>
    document.getElementById("p2").style.color = "blue";
    document.getElementById("p2").style.fontFamily = "Arial";
    document.getElementById("p2").style.fontSize = "larger";
  </script>

</body>
</html>
        