If you can get a browser onto the machine, you can run the JavaScript. You can also use a webserver to try to run server-side script, but this is a little iffy. It's more of a toy than a tool.
You can also try things like Google's jslibs or Mozilla's SpiderMonkey, which allow you to run JS programs without a browser.
In all cases outside a browser, your mileage may vary.
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The aim of all computer languages is to make it easier for humans to create and modify machine code, the native language of the machine.
To add javascript code in HTML, you have to include the script tag on top. It can be added as <script src="source of script"></script>
To embed JavaScript code is to include it in the HTML page. For example, this will embed the code to display an alert: <script type="text/javascript"> alert("Embedded alert!"); </script>
Maybe with VB-script, if the browser is Internet Explorer.
Javascript inside html <html> <head> <script type="text/javascript" language="javascript"> // Java script code here </script> <body> // html code here </body> </html> Via External Link: <html> <head> <script type="text/javascript" language="javascript" src="location of js file"> </script> <body> // html code here </body> </html>