HarmonyOS Map类型调用get获取不到值

this.tableBody[0]非Map类型，所以不能使用map的方法，可以使用instanceOf判断一下this.tableBody[0]是否为map类型

可以参考下述demo修改代码：

import { HashMap } from '@kit.ArkTS';
@Entry
@Component
struct Index {
  @State message: string = 'Hello World';
  @State tableBody: Map<string, object>[] = [];

  aboutToAppear(): void {
    let body: Map<string, object> = new Map<string, object>();
    body.set('instructId', new String('222'))
    body.set('portfolioId', new String('22'))
    body.set('hsCode', new String('12'))
    this.tableBody.push(body)
    console.info("tableBody:" + this.mapToString(this.tableBody[0]));
    console.info("tableBody2:" + this.tableBody[0].get('instructId'));
  }

  mapToString(map: Map<string, string | object>): string {
    if (map.size === 0) {
      return '';
    }

    let obj: object = new Object;
    map.forEach((value, key) => {
      if (value instanceof Map) {
        obj[key] = this.mapToString(value);
      }else {
        obj[key] = value;
      }
    })
    return JSON.stringify(obj);
  }

  build() {
    RelativeContainer() {
      Text(this.message)
        .id('HelloWorld')
        .fontSize(50)
        .fontWeight(FontWeight.Bold)
        .alignRules({
          center: { anchor: '__container__', align: VerticalAlign.Center },
          middle: { anchor: '__container__', align: HorizontalAlign.Center }
        })
    }
    .height('100%')
    .width('100%')
  }
}
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