报表设计器 designer 在Vue 如何获取spread 对象

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<template>
  <div id="app">
<gc-spread-sheets-designer :styleInfo='styleInfo' :config='config' @designerInitialized='designerInitialized'>
</gc-spread-sheets-designer>
  </div>
</template>

<script>

  import '@grapecity/spread-sheets/styles/gc.spread.sheets.excel2013white.css'
  import '@grapecity/spread-sheets-designer/styles/gc.spread.sheets.designer.min.css'
  import '@grapecity/spread-sheets-designer-resources-cn';
  import GC from '@grapecity/spread-sheets';
  GC.Spread.Common.CultureManager.culture("zh-cn");
  import '@grapecity/spread-sheets-resources-zh';

  import { Designer } from '@grapecity/spread-sheets-designer-vue'

  export default {
name: 'App',
data: function () {
   return {
      styleInfo: { height: "98vh", width: '100%' },
      config: null,
      spread:null,
      designer: null
   };
},
methods: {
   designerInitialized(value) {
      this.designer = value;
      this.spread=?????,
   }
}
  }
</script>
<style>
</style>