在使用mavon-editor时没有效果？

页面代码：

<template>
  <div class="form-contain">
    <a-form :form="formData" @submit="handleSubmit">
      <a-form-item label="标题">
        <a-input v-model="formData.title" />
      </a-form-item>
      <a-form-item label="描述">
        <a-input v-model="formData.description" />
      </a-form-item>
      <a-form-item class="content" label="内容">
        <mavon-editor class="mavon-editor" v-model="formData.content"></mavon-editor>
      </a-form-item>
      <a-form-item>
        <a-button type="primary" html-type="submit">
          发布
        </a-button>
      </a-form-item>
    </a-form>
  </div>
</template>

<script setup lang="ts">
import MavonEditor from 'mavon-editor';
import 'mavon-editor/dist/css/index.css';
const formData = {
      title: '',
      description: '',
      content: '',
};

const handleSubmit = () => {
      // 处理表单提交逻辑
    };

</script>

<style>
.form-contain {
  padding: 20px;
  margin: 0 auto;
  max-width: 1024px;
}
.mavon-editor {
  width: 500px;
  height: 500px;}

</style>

全局引入：

import { createApp } from "vue";
import App from "./App.vue";
import router from "./router";
import Antd from "ant-design-vue";
import "ant-design-vue/dist/antd.css";
import mavonEditor from 'mavon-editor'
import 'mavon-editor/dist/css/index.css'


createApp(App).use(Antd).use(router).use(mavonEditor).mount("#app");

package.json

 "dependencies": {
    "ant-design-vue": "^3.3.0-beta.4",
    "async-validator": "^4.2.5",
    "axios": "^1.3.4",
    "core-js": "^3.8.3",
    "highlight.js": "^11.7.0",
    "lodash-es": "^4.17.21",
    "marked": "^4.3.0",
    "mavon-editor": "^2.10.4",
    "moment": "^2.29.4",
    "store": "^2.0.12",
    "vue": "^3.2.13",
    "vue-markdown": "^2.2.4",
    "vue-router": "^4.0.3",
    "vuex": "^4.1.0"
  },

实际效果：