51help TIY
码：
<!DOCTYPE HTML> <html> <head> <script type="text/javascript"> function msg() { alert("Hello world!"); } </script> </head> <body> <form> <input type="button" value="点击这里" onclick="msg()" /> </form> <p> JavaScript更多有关 JavaScript JavaScript 教程。</p> </body> </html>
查看结果: