Add target="_blank" for all external links

Author: abcdw

_layouts/default.html

@@ -28,3 +28,11 @@
   ga('create', 'UA-61698331-1', 'auto');
   ga('send', 'pageview');
 </script>
+<script>
+    var links = document.links;
+    for (var i = 0, linksLength = links.length; i < linksLength; i++) {
+        if (links[i].hostname != window.location.hostname) {
+            links[i].target = '_blank';
+        }
+    }
+</script>