Properly handle hash URL changes. (#996)

* Properly handle hash URL changes.

* Make sure we replace origin correctly.

* Get rid of RegExp for getUrl().

lib/router/router.js

@@ -34,11 +34,18 @@ export default class Router extends EventEmitter {
   }
 
   async onPopState (e) {
-    // Older versions of safari and chrome tend to fire popstate event at the
-    // page load.
-    // We should not complete that event and the following check will fix it.
-    // Fixes:
     if (!e.state) {
+      // We get state as undefined for two reasons.
+      //  1. With older safari (< 8) and older chrome (< 34)
+      //  2. When the URL changed with #
+      //
+      // In the both cases, we don't need to proceed and change the route.
+      // (as it's already changed)
+      // But we can simply replace the state with the new changes.
+      // Actually, for (1) we don't need to nothing. But it's hard to detect that event.
+      // So, doing the following for (1) does no harm.
+      const { pathname, query } = this
+      this.replace(format({ pathname, query }), getURL())
       return
     }
 
@@ -276,7 +283,8 @@ export default class Router extends EventEmitter {
 }
 
 function getURL () {
-  return window.location.pathname + (window.location.search || '') + (window.location.hash || '')
+  const { href, origin } = window.location
+  return href.substring(origin.length)
 }
 
 function toRoute (path) {