JSFiddle - React, Tailwind, and code Playground
HTML
<a href="http://fiddle.jsfiddle.net/123">link</a><br/>
<a href="http://google.com/">google</a><br/>
<a href="http://jsfiddle.net/WJEVy">link</a><br/>
<a href="http://yahoo.com">yahoo</a><br/>
<a href="/fiddle">yahoo</a><br/>
JavaScript
$(document).ready(function(){
$('a')
.not('[href~="' + location.hostname + '"]')
.filter(function(){ return location.hostname!=this.hostname; })
.attr('target','_blank');
});