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的内容.</p> <button type="button" onclick="document.getElementById('demo').innerHTML = 'Hello JavaScript!'">点击我!</button> </body> </html>
运行结果