// data 為 表格數(shù)據(jù) ， params 為需要合并的字段
groupBy (data, params) {
    const groups = {};
    data.forEach(v => {
    	// 獲取data中的傳入的params屬性對(duì)應(yīng)的屬性值
        const group = JSON.stringify(v[params]);
        // 把group作為groups的key，初始化value，循環(huán)時(shí)找到相同的v[params]時(shí)不變
        groups[group] = groups[group] || [];
        // 將對(duì)應(yīng)找到的值作為value放入數(shù)組中
        groups[group].push(v);
    })
    // 返回處理好的二維數(shù)組
    return Object.values(groups);
},

arr.map(res => {
    // 每次遍歷都刪除data && this.tableListData.items的第一個(gè)元素
    data.shift()
    // 每次遍歷都將arr數(shù)組元素對(duì)應(yīng)push進(jìn) data && this.tableListData.items
    data.push(res)
})

  const redata = arr.map(v => v[params])
  redata.reduce((old, cur, i) => {
    // old 上一個(gè)元素  cur 當(dāng)前元素  i 索引
    if (i === 0) {
      // 第一次判斷先增加一個(gè) 1 占位 ，索引為0 
      this.spanArr.push(1)
      pos = 0
    } else {
      if (cur === old) {
        this.spanArr[pos] += 1
        this.spanArr.push(0)
      } else {
        this.spanArr.push(1)
        pos = i
      }
    }
    return cur
  }, {})

spanMethod({ row, column, rowIndex, columnIndex }) {
  // 第一列
  if (columnIndex === 0) {
    const _row = this.spanArr[rowIndex];
    const _col = _row > 0 ? 1 : 0;
    return {
      rowspan: _row,
      colspan: _col
    }
  }
}

// ......
    mounted() {
      this.getSpanArr(this.tableListData.items, 'FirstIndex');
    },
    methods: {
      groupBy (data, params) {
        const groups = {}
        data.forEach(v => {
          const group = JSON.stringify(v[params])
          groups[group] = groups[group] || []
          groups[group].push(v)
        })
        return Object.values(groups)
      },
      getSpanArr (data, params) {
        let arr = []
        let pos = 0
        this.spanArr = []
        this.groupBy(data, params).map(v => (arr = arr.concat(v)))
        arr.map(res => {
          data.shift()
          data.push(res)
        })
        const redata = arr.map(v => v[params])
        redata.reduce((old, cur, i) => {
          if (i === 0) {
            this.spanArr.push(1)
            pos = 0
          } else {
            if (cur === old) {
              this.spanArr[pos] += 1
              this.spanArr.push(0)
            } else {
              this.spanArr.push(1)
              pos = i
            }
          }
          return cur
        }, {})
      },
      spanMethod({ row, column, rowIndex, columnIndex }) {
        if (columnIndex === 0) {
          const _row = this.spanArr[rowIndex];
          const _col = _row > 0 ? 1 : 0;
          return {
            rowspan: _row,
            colspan: _col
          }
        }
      }
    }