常见的前端对数据的操作方法

[
  {
    "name": "蒸汽锅炉 A 年度检验报告",
    "sort": 5,
    "analysisComponent": "组件类型",
    "trHeadVOList": [],
    "trContentVOList": [
      {
        "jieguo": "√",
        "jianyanxiangmu": "1)锅炉日常运行记录是否齐全",
        "beizhu": "备注",
        "jianyanneirong1": "null",
        "jianyanneirong": "安全管理情况"
      },
      {
        "jieguo": "√",
        "jianyanxiangmu": "2)锅炉图样、产品质量说明书、使用说明书、检验证书、检验报告及维修、改造资料是否齐全",
        "beizhu": "null",
        "jianyanneirong1": "null",
        "jianyanneirong": "安全管理情况"
      },
      {
        "jieguo": "---",
        "jianyanxiangmu": "3)上次检验报告中所提出的问题是否解决",
        "beizhu": "null",
        "jianyanneirong1": "null",
        "jianyanneirong": "安全管理情况"
      },
      {
        "jieguo": "√",
        "jianyanxiangmu": "1)测温仪表的量程与其检测的温度范围的匹配情况",
        "beizhu": "null",
        "jianyanneirong1": "温度测量装置",
        "jianyanneirong": "安全附件和仪表"
      },
      {
        "jieguo": "√",
        "jianyanxiangmu": "2)测温仪表的外观情况",
        "beizhu": "null",
        "jianyanneirong1": "温度测量装置",
        "jianyanneirong": "安全附件和仪表"
      },
      {
        "jieguo": "√",
        "jianyanxiangmu": "3)温度仪表是否在检验或校准有效期内",
        "beizhu": "null",
        "jianyanneirong1": "温度测量装置",
        "jianyanneirong": "安全附件和仪表"
      },
      {
        "jieguo": "√",
        "jianyanxiangmu": "4)螺纹固定的测温元件的泄漏情况",
        "beizhu": "null",
        "jianyanneirong1": "温度测量装置",
        "jianyanneirong": "安全附件和仪表"
      },
      {
        "jieguo": "√",
        "jianyanxiangmu": "1)安全阀是否在检验有效期",
        "beizhu": "null",
        "jianyanneirong1": "安全阀",
        "jianyanneirong": "安全附件和仪表"
      },
      {
        "jieguo": "√",
        "jianyanxiangmu": "2)安全阀阀体和法兰面是否泄漏",
        "beizhu": "null",
        "jianyanneirong1": "安全阀",
        "jianyanneirong": "安全附件和仪表"
      },
      {
        "jieguo": "√",
        "jianyanxiangmu": "1)压力表外观、精度等级、量程是否符合要求",
        "beizhu": "null",
        "jianyanneirong1": "压力表",
        "jianyanneirong": "安全附件和仪表"
      },
      {
        "jieguo": "√",
        "jianyanxiangmu": "2)同一系统上各压力表的读数是否一致",
        "beizhu": "null",
        "jianyanneirong1": "压力表",
        "jianyanneirong": "安全附件和仪表"
      },
      {
        "jieguo": "√",
        "jianyanxiangmu": "3)压力表是否在检验有效期",
        "beizhu": "null",
        "jianyanneirong1": "压力表",
        "jianyanneirong": "安全附件和仪表"
      },
      {
        "jieguo": "√",
        "jianyanxiangmu": "4)压力表、压力取样管和阀门的损坏、泄漏情况",
        "beizhu": "null",
        "jianyanneirong1": "压力表",
        "jianyanneirong": "安全附件和仪表"
      },
      {
        "jieguo": "√",
        "jianyanxiangmu": "1)检查排污阀和排污管的振动、渗漏情况",
        "beizhu": "null",
        "jianyanneirong1": "null",
        "jianyanneirong": "排污和放水装置"
      },
      {
        "jieguo": "√",
        "jianyanxiangmu": "2)检查排污管是否通畅，并见证锅炉操作人员进行排污试验",
        "beizhu": "null",
        "jianyanneirong1": "null",
        "jianyanneirong": "排污和放水装置"
      }
    ]
  }
]

实现将相同数据进行统计：

[
  {
    "jianyanneirong": "安全管理情况",
    "length": "3",
    "jianyanneirongList": []
  },
  {
    "jianyanneirong": "安全附件和仪表",
    "length": "10",
    "jianyanneirongList": [
      {
        "jianyanneirong1": "温度测量装置",
        "length1": "4"
      },
      {
        "jianyanneirong1": "安全阀",
        "length1": "2"
      },
      {
        "jianyanneirong1": "压力表",
        "length1": "3"
      }
    ]
  },
  {
    "jianyanneirong": "排污和放水装置",
    "length": "2",
    "jianyanneirongList": []
  }
]

实现代码：

const result = [];

        // 遍历 trContentVOList
        contentList.forEach((item,index) => {
          const jianyanneirong = item.jianyanneirong;
          const jianyanneirong1 = item.jianyanneirong1;

          // 检查是否已存在对应的 jianyanneirong
          let existingItem = result.find(obj => obj.jianyanneirong === jianyanneirong);

          if (!existingItem) {
            // 创建新的 jianyanneirong 对象
            existingItem = {
              jianyanneirong: jianyanneirong,
              length: 0,
              jianyanneirongList: [],
              data: []
            };
            result.push(existingItem);
          }

          //if (existingItem) {
            // 将这条数据存入data中
            //existingItem.data.push(contentList[index])
          //}

          if (jianyanneirong1) {
            // 检查是否已存在对应的 jianyanneirong1
            let existingItem1 = existingItem.jianyanneirongList.find(obj => obj.jianyanneirong1 === jianyanneirong1);

            if (!existingItem1) {
              // 创建新的 jianyanneirong1 对象
              existingItem1 = {
                jianyanneirong1: jianyanneirong1,
                length1: 0
              };
              existingItem.jianyanneirongList.push(existingItem1);
            }

            // 增加 jianyanneirong1 的长度
            existingItem1.length1++;
          }

          // 增加 jianyanneirong 的长度
          existingItem.length++;
        });

        console.log(result)
        this.contentList = result
      })

结果：