返回的是一维数组

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o:[{id:1,name:s;age:11},{id:1,name:s;age:11},{id:2,name:p;age:15}]

　1、对返回的数据做处理

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getData() {
 that.tableData = res.data.data.list;
that.getFormatList(); // 重新合并行
},
 
getFormatList() {
      let recordObj = {};
      this.recordIndexArr = [];
 
      this.tableData.forEach((element, index) => {
        element.rowIndex = index;
        if (recordObj[element.recordId]) {
          recordObj[element.recordId].push(index);
        } else {
          recordObj[element.recordId] = [];
          recordObj[element.recordId].push(index);
        }
      });
      // 将数组长度大于1的值 存储到this.recordIndexArr（也就是需要合并的项）
      for (let k in recordObj) {
        if (recordObj[k].length > 1) {
          this.recordIndexArr.push(recordObj[k]);
        }
      }
       
    },

　　2、合并行

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objectSpanMethod({ row, column, rowIndex, columnIndex }) {
      if (columnIndex <= 9) {
        for (let i = 0; i < this.recordIndexArr.length; i++) {
          let element = this.recordIndexArr[i];
          for (let j = 0; j < element.length; j++) {
            let item = element[j];
            if (rowIndex == item) {
              if (j == 0) {
                return {
                  rowspan: element.length,
                  colspan: 1
                };
              } else if (j != 0) {
                return {
                  rowspan: 0,
                  colspan: 0
                };
              }
            }
          }
        }
      }
    },

　　完成