<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <script> function myfunction() { document.getElementById("demo").innerHTML = "亲爱的，我在听歌！"; } </script> </head> <body> <h1>My Wed Page</h1> <p id="demo">你在干嘛？</p> <button type="button" onclick="myfunction()">一定要点这里哟！</button> </body> </html>