源代码
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>编程字典</title> </head> <body> <h1>我的第一个 JavaScript</h1> <p id="demo">JavaScript 可以改变HTML元素的样式.</p> <script> function myFunction() { document.getElementById("demo").style.fontSize = "25px"; document.getElementById("demo").style.color = "red"; } </script> <button type="button" onclick="myFunction()">点击我!</button> </body> </html>
运行结果