feat: say hello to umd (#18)

src/disqus.js

@@ -21,6 +21,21 @@
  * @param {number} disqusjs.page.length - How many comment in the thread
  */
 
+
+(function (root, factory) {
+    if (typeof define === 'function' && define.amd) {
+        // AMD. Register as an anonymous module.
+        define('DisqusJS', [], factory);
+    } else if (typeof module === 'object' && module.exports) {
+        // Node. Does not work with strict CommonJS, but
+        // only CommonJS-like environments that support module.exports,
+        // like Node.
+        module.exports = factory();
+    } else {
+        // Browser globals (root as window)
+        root.DisqusJS = factory();
+    }
+}(typeof self !== 'undefined' ? self : this, function () {
     function DisqusJS(config) {
         /*
          * get - 封装 XHR GET
@@ -612,4 +627,5 @@ function DisqusJS(config) {
         }
     }
 
-export default DisqusJS;
+    return DisqusJS
+}));