simplify some examples

_examples/file-server/single-page-application/basic/public/index.js

@@ -0,0 +1,21 @@
+const NotFound = { template: '<p>Page not found</p>' }
+const Home = { template: '<p>home page</p>' }
+const About = { template: '<p>about page</p>' }
+
+const routes = {
+  '/': Home,
+  '/about': About
+}
+
+const app = new Vue({
+  el: '#app',
+  data: {
+    currentRoute: window.location.pathname
+  },
+  computed: {
+    ViewComponent () {
+      return routes[this.currentRoute] || NotFound
+    }
+  },
+  render (h) { return h(this.ViewComponent) }
+})