数组中，子元素通过某个相同字段，将子元素中相同的字段放入一个对象内，且子元素中的子数组完成合并

案例如下

let list = [
    {
      defineCode: "001",
      defineName: "分级名称1",
      gradeType: "分级类型1",
      orgVos: [
        {
          orgCode: "组织编码1",
          orgName: "组织名称1",
        },
      ],
    },
    {
      defineCode: "001",
      defineName: "分级名称1",
      gradeType: "分级类型1",
      orgVos: [
        {
          orgCode: "组织编码2",
          orgName: "组织名称2",
        },
      ],
    },
    {
      defineCode: "002",
      defineName: "分级名称2",
      gradeType: "分级类型2",
      orgVos: [
        {
          orgCode: "组织编码2",
          orgName: "组织名称2",
        },
      ],
    },
  ];

  const mergedList = list.reduce((acc, curr) => {
    const existingItem = acc.find(item => item.defineName === curr.defineName);
    if (existingItem) {
      existingItem.orgVos = [...existingItem.orgVos, ...curr.orgVos];
    } else {
      acc.push(curr);
    }
    return acc;
  }, []);
  console.log(mergedList)

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打印内容如下