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!");