修复bug

src/main.js

@@ -15,11 +15,13 @@ import '@/assets/css/public/common.min.css'
 import '@/assets/css/font/iconfont.css'
 
 Vue.use(Alert);
-Vue.prototype.$msgbox = MessageBox;
-Vue.prototype.$alert = MessageBox.alert;
-Vue.prototype.$confirm = MessageBox.confirm;
-Vue.prototype.$prompt = MessageBox.prompt;
-Vue.prototype.$message = Message;
+const msgbox = MessageBox
+const {alert, confirm} = msgbox
+
+Vue.prototype.$msgbox = msgbox
+Vue.prototype.$alert = alert
+Vue.prototype.$confirm = confirm
+Vue.prototype.$message = Message
 
 
 //本地环境开启提示信息