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vant/packages/vant-cli/site/mobile/main.js

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+import Vue from 'vue';
+import DemoBlock from './components/DemoBlock';
+import DemoSection from './components/DemoSection';
+import { router } from './router';
+import App from './App';
+import '@vant/touch-emulator';
+
+if (process.env.NODE_ENV !== 'production') {
+  Vue.config.productionTip = false;
+}
+
+Vue.component(DemoBlock.name, DemoBlock);
+Vue.component(DemoSection.name, DemoSection);
+
+setTimeout(() => {
+  new Vue({
+    el: '#app',
+    render: h => h(App),
+    router,
+  });
+}, 0);