1// Works like jQuery's $(document).ready.
 2// Supports IE8+. Courtesy of http://youmightnotneedjquery.com/
 3function ready(fn) {
 4  if (document.readyState != 'loading') {
 5    fn();
 6  } else if (document.addEventListener) {
 7    document.addEventListener('DOMContentLoaded', fn);
 8  } else {
 9    document.attachEvent('onreadystatechange', function() {
10      if (document.readyState != 'loading')
11        fn();
12    });
13  }
14}
15
16ready(function() {
17
18  var website = window.location.hostname;
19
20  var internalLinkRegex = new RegExp('^((((http:\\/\\/|https:\\/\\/)(www\\.)?)?'
21                                     + website
22                                     + ')|(localhost:\\d{4})|(\\/.*))(\\/.*)?$', '');
23
24  var anchorEls = document.querySelectorAll('a');
25  var anchorElsLength = anchorEls.length;
26
27  for (var i = 0; i < anchorElsLength; i++) {
28    var anchorEl = anchorEls[i];
29    var href = anchorEl.getAttribute('href');
30
31    if (!internalLinkRegex.test(href)) {
32      anchorEl.setAttribute('target', '_blank');
33    }
34  }
35});