[Doc] update demo

docs/src/mobile.js

@@ -1,26 +1,25 @@
 import '../../packages/index.less';
 import Vue from 'vue';
 import VueRouter from 'vue-router';
-import { progress } from '@vant/doc';
 import App from './WapApp';
 import routes from './router';
+import { importAll } from './utils';
 import '@vant/touch-emulator';
 
+const componentMap = {};
+const context = require.context('../../packages', true, /demo\/index.vue$/);
+
+importAll(componentMap, context);
+
 const router = new VueRouter({
   mode: 'hash',
-  routes: routes(true),
+  routes: routes({ mobile: true, componentMap }),
   scrollBehavior(to, from, savedPosition) {
     return savedPosition || { x: 0, y: 0 };
   }
 });
 
-router.beforeEach((route, redirect, next) => {
-  progress.start();
-  next();
-});
-
 router.afterEach(() => {
-  progress.done();
   if (!router.currentRoute.redirectedFrom) {
     Vue.nextTick(() => window.syncPath());
   }