element ui中 的table行合并的通用方法

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不是我写的，只是在这里记录一下，以防以后找不着了

data() {
  return {
    table: [{
      id: '1',
      checkRoom: 'CTROOM',
      checkProject: '颈椎MRICT',
      checkMoney: '300.22',
      attention: '检查前空腹',
      appointmentTime: ''
    },{
      id: '1',
      checkRoom: 'CTROOM',
      checkProject: '颈椎MRICT1',
      checkMoney: '303.22',
      attention: '检查前空腹',
      appointmentTime: ''
    },{
      id: '1',
      checkRoom: 'CTROOM',
      checkProject: '颈椎MRICT22',
      checkMoney: '340.22',
      attention: '检查前空腹',
      appointmentTime: '2019-5-29 10:30'
    },{
      id: '1',
      checkRoom: 'DR',
      checkProject: '鼻骨',
      checkMoney: '340.22',
      attention: '检查前空腹',
      appointmentTime: '2019-5-29 9:30'
    }]
  };
},
created(){
  // 给table赋值，重新遍历新增rowSpan属性，checkRoom，appointmentTime为table里面需要合并的属性名称
    this.table = this.mergeTableRow({
      data: this.table,
      mergeColNames: ['checkRoom', 'checkMoney', 'attention', 'appointmentTime'], // 需要合并的列，默认合并列相同的数据
      firstMergeColNames: ['attention'], // 受影响的列，只合并以firstMerge为首的同类型数据
      firstMerge: 'checkRoom' // 以哪列为基础进行合并，一般为第一列
    })
    // 例如：如果firstMerge: 'checkRoom'合并了三行，受影响的列也应该是最多合并三行，请看下图1
    // 例如：如果firstMerge: 'checkMoney'合并了两行，受影响的列也应该是最多合并两行，请看下图2
 
},
methods: {
  objectSpanMethod({ row, column, rowIndex, columnIndex }) {
     const span = column['property'] + '-span'
     if(row[span]){
         return row[span]
     }
  }
}

/**
 * 方法二
 * 改良后（不相邻的数据相互不受影响）
 *  table合并行通用 */
export function mergeTableRow(config) {
  let data = config.data
  const { mergeColNames, firstMergeColNames, firstMerge } = config
  if (!mergeColNames || mergeColNames.length === 0) {
    return data
  }
  mergeColNames.forEach((m) => {
    const mList = {}
    data = data.map((v, index) => {
      const rowVal = v[m]
      if (mList[rowVal] && mList[rowVal].newIndex === index) {
        const flag = firstMergeColNames.filter((f) => { return f === m }).length !== 0
        const mcFlag = mergeColNames.filter((mc) => { return mc === firstMerge }).length === 0
        if ((mcFlag && flag) || (flag && data[index][firstMerge + '-span'] && data[index][firstMerge + '-span'].rowspan === 1)) {
          v[m + '-span'] = {
            rowspan: 1,
            colspan: 1
          }
        } else {
          data[mList[rowVal]['index']][m + '-span'].rowspan++
          v[m + '-span'] = {
            rowspan: 0,
            colspan: 0
          }
          mList[rowVal]['num']++
          mList[rowVal]['newIndex']++
        }
      } else {
        mList[rowVal] = { num: 1, index: index, newIndex: index + 1 }
        v[m + '-span'] = {
          rowspan: 1,
          colspan: 1
        }
      }
      return v
    })
  })
  return data
}