​x
 
<!DOCTYPE html>
<html>
<body>
​
<h3>如何访问 SECTION 元素的演示</h3>
​
<section id="mySection">
  <h1>Section Heading</h1>
  <p>Some text in section..</p>
</section>
​
<p>单击按钮将节内容的文本颜色设置为红色。</p>
​
<button onclick="myFunction()">试一试</button>
​
<script>
function myFunction() {
  var x = document.getElementById("mySection");
  x.style.color = "red";
}
</script>
​
</body>
</html>
​