JavaScript sê siŏh cṳ̄ng giók-buōng ngṳ̄-ngiòng (iâ hô̤ lā̤ chiū-gō̤ ngṳ̄-ngiòng).

Â-dā̤ sê sāi JavaScript siā gì, â̤ hiēng-sê "Hello World" gì dâi-mā:

<!DOCTYPE HTML><html>    <head>    <title>Gāng-dăng  JavaScript Hello World</title>        <script type="text/javascript">            document.write("Hello, world!");               alert("Hello, world!");                        console.log("Hello, world!");              </script>    </head>    <body>HTML nô̤i-ṳ̀ng    </body></html>

hĕ̤k-ciā diŏh liù-lāng-ké gì "location bar" diē-sié sāi javascript:, ī hô-dông gì huŏng-sék lì biēu-sê:

javascript:alert("Hello world!");