JSFiddle - React, Tailwind, and code Playground

HTML

<a href="blah">blah</a>
<a href="http://blah">ald</a>
<a href="http://blahsf">asdfld</a>
<a href="#">nfe</a>

JavaScript

$(document).ready( function() {
        $('a').filter( function() {
            return $(this).attr('href').substr(0, 7) == "http://";
        }).attr('target', '_blank');
    });