<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>菜鸟教程(w3cdata.com)</title> </head> <body> <h1>我的网页</h1> <p id="demo">我的第一个段落。</p> <script> document.getElementById("demo").innerHTML = "你好 Dolly"; </script> </body> </html>