复杂表格合并

function groupData(data) {
  let currentFinalPerformanceScore = ''
  let currentOverallWorkHourRatio = ''
  let currentPerformanceScore = ''
  let currentProjectName = ''
  let currentProjectScore = ''
  let currentGoalsHour = ''
  let currentProjectFractionRatio = ''

  return data.map((item, index) => {
    if (currentFinalPerformanceScore !== item.finalPerformanceScore) {
      currentFinalPerformanceScore = item.finalPerformanceScore
      item.finalPerformanceScoreSpan = calculateSpan(
        data,
        index,
        'finalPerformanceScore',
        currentFinalPerformanceScore
      )
    } else {
      item.finalPerformanceScoreSpan = 0
    }

    if (currentOverallWorkHourRatio !== item.overallWorkHourRatio) {
      currentOverallWorkHourRatio = item.overallWorkHourRatio
      item.overallWorkHourRatioSpan = calculateSpan(
        data,
        index,
        'overallWorkHourRatio',
        currentOverallWorkHourRatio
      )
    } else {
      item.overallWorkHourRatioSpan = 0
    }

    if (currentPerformanceScore !== item.performanceScore) {
      currentPerformanceScore = item.performanceScore
      item.performanceScoreSpan = calculateSpan(data, index, 'performanceScore', currentPerformanceScore)
    } else {
      item.performanceScoreSpan = 0
    }

    if (currentProjectName !== item.projectName) {
      currentProjectName = item.projectName
      item.projectNameSpan = calculateSpan(data, index, 'projectName', currentProjectName)
    } else {
      item.projectNameSpan = 0
    }

    if (currentProjectScore !== item.projectScore) {
      currentProjectScore = item.projectScore
      item.projectScoreSpan = calculateSpan(data, index, 'projectScore', currentProjectScore)
    } else {
      item.projectScoreSpan = 0
    }

    if (currentGoalsHour !== item.goalsHour) {
      currentGoalsHour = item.goalsHour
      item.goalsHourSpan = calculateSpan(data, index, 'goalsHour', currentGoalsHour)
    } else {
      item.goalsHourSpan = 0
    }

    if (currentProjectFractionRatio !== item.projectFractionRatio) {
      currentProjectFractionRatio = item.projectFractionRatio
      item.projectFractionRatioSpan = calculateSpan(
        data,
        index,
        'projectFractionRatio',
        currentProjectFractionRatio
      )
    } else {
      item.projectFractionRatioSpan = 0
    }

    return item
  })
}

function calculateSpan(data, index, property, value) {
  let span = 0
  for (let i = index; i < data.length; i++) {
    if (data[i][property] === value) {
      span += 1
    } else {
      break
    }
  }
  return span
}