Well first, you'll need to use proper syntax:
The above code assumes string.js resides in the same directory as the web page you're calling it from.
Second, you have your tags in the wrong order. The goes above
Third, you have no doctype designated so the browser is left to guess what the code is.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<meta name="description" content="A web page about string objects.">
This also assumes that string.js needs to be in the body and not the head section.