Doc: improve iframe load speed

docs/src/ExamplesDocsApp.vue

@@ -1,6 +1,6 @@
 <template>
   <div class="app">
-    <zan-doc :simulator="simulatorSrc" :config="config">
+    <zan-doc :simulator="simulator" :config="config">
       <router-view></router-view>
     </zan-doc>
   </div>
@@ -12,12 +12,14 @@ import docConfig from './doc.config';
 export default {
   data() {
     return {
+      simulator: this.getSimulatorPath(),
       config: docConfig['zh-CN']
     };
   },
-  computed: {
-    simulatorSrc() {
-      const dir = this.$route.path.split('/').pop();
+
+  methods: {
+    getSimulatorPath() {
+      const dir = location.pathname.split('/').pop();
       if (dir === 'quickstart' || dir === 'changelog') {
         return '/zanui/vue/examples';
       } else {