源代码
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>享学课堂</title> </head> <body> <h1>JavaScript能做什么?</h1> <p id="demo">JavaScript能改变HTML元素的样式.</p> <button type="button" onclick="document.getElementById('demo').style.fontSize='35px'">点击我!</button> </body> </html>
运行结果