<!DOCTYPE html> <html> <body> <h1 id="myH1">Element 对象</h1> <h2>style 属性</h2> <p id="myP">单击“更改”为我添加红色的背景颜色。</p> <button onclick="myFunction()">更改</button> <script> function myFunction() { document.getElementById("myP").style.backgroundColor = "red"; } </script> </body> </html>