fix bugs

main.js

@@ -0,0 +1,21 @@
+import App from './App'
+
+// #ifndef VUE3
+import Vue from 'vue'
+Vue.config.productionTip = false
+App.mpType = 'app'
+const app = new Vue({
+    ...App
+})
+app.$mount()
+// #endif
+
+// #ifdef VUE3
+import { createSSRApp } from 'vue'
+export function createApp() {
+  const app = createSSRApp(App)
+  return {
+    app
+  }
+}
+// #endif