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<!DOCTYPE html> <html> <body> <h1>我的第一个 JavaScript</h1> <p id="demo">JavaScript 可以更改 HTML 元素的样式。</p> <script> function myFunction() { document.getElementById("demo").style.fontSize = "25px"; document.getElementById("demo").style.color = "red"; document.getElementById("demo").style.backgroundColor = "yellow"; } </script> <button type="button" onclick="myFunction()">单击我！</button> </body> </html>