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<!DOCTYPE html> <html> <body> <h3>如何访问 HEADER 元素的演示</h3> <article> <header id="myHeader"> <h3>Internet Explorer 9</h3> </header> <p>Windows Internet Explorer 9（简称 IE9）于 2011 年 3 月 14 日 21:00 PDT 向公众发布......</p> </article> <p>单击按钮将标题元素的颜色设置为红色。</p> <button onclick="myFunction()">试一试</button> <script> function myFunction() { var x = document.getElementById("myHeader"); x.style.color = "red"; } </script> </body> </html>