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

1// jQuery
2$.getScript('/path/to/imported/script.js', function()
3{
4    // script is now loaded and executed.
5    // put your dependent JS here.
6});

1var jsFile = document.createElement("script");
2jsFile.src = "homePage.js";  // it can be path also  "{themes('/scripts/homePage.js')}"
3document.body.appendChild(jsFile);  //append it as src to body