how do you include a file in gavascript code example

Example 1: linking a script .js

<script type="text/javascript" src="path-to-javascript-file.js"></script>

Example 2: include other js files in a js file

document.writeln("<script type='text/javascript' src='Script1.js'></script>");
document.writeln("<script type='text/javascript' src='Script2.js'></script>");