更新对象属性将更新该对象中的所有其他相同属性

Question

这使我困惑不已。我正在尝试根据另一个函数提供的变量动态更新对象属性，但是，当我更新该属性时，它将更新父对象的所有相同嵌套属性。

export type TopContributing = {
  totalInTopFive: number
  one: BreakdownForName
  two: BreakdownForName
  three: BreakdownForName
  four: BreakdownForName
  five: BreakdownForName
  others: BreakdownForName
}

export type BreakdownForName = {
  name: string
  itemBreakdown: {
    cancelled: MetricValue
    outstanding: MetricValue
    reclassifiedAsIssue: MetricValue
    reclassifiedAsValid: MetricValue
  }
}

type MetricValue = { 
    items: object[]; 
    count: number 
}

const populateTopOutcomes = (
  item: object, //the object to push to topItems
  outcome: string, //the itemBreakdown property e.g. outstanding, reclassifiedAsValid, etc.
  topItems: TopContributing, // the parent Object that contains Top5Items, others and totalCount.
  topFive: string[] // list of names of top items
) => {
  const itemIndex = topFive.indexOf(item.name) // find index of which bucket in topItems the item's in
  if (itemIndex === 0) {
    topItems.one.itemBreakdown[outcome].items.push(item)
    topItems.one.itemBreakdown[outcome].count++
  }
  else if (itemIndex === 1)  {
    topItems.two.itemBreakdown[outcome].items.push(item)
    topItems.two.itemBreakdown[outcome].count ++
  }
  else if (itemIndex  === 2)  {
    topItems.three.itemBreakdown[outcome].items.push(item)
    topItems.three.itemBreakdown[outcome].count ++
  }
  else if (itemIndex  === 3)  {
    topItems.four.itemBreakdown[outcome].items.push(item)
    topItems.four.itemBreakdown[outcome].count ++
  }
  else if (itemIndex  === 4)  {
    topItems.five.itemBreakdown[outcome].items.push(item)
    topItems.five.itemBreakdown[outcome].count ++
  }
  else if (itemIndex  < 0)  {
    topItems.others.itemBreakdown[outcome].items.push(item)
    topItems.others.itemBreakdown[outcome].count ++
  }
}

我遇到的问题是，当我使用结果访问topItems。{property} .itemBreakdown [outcome]中的MetricValue对象时，它将更新TopContributing对象中所有对象的属性（项目或计数）。例如，如果我尝试更新topItems.one中的结果“ outstanding”，它将为topItems.two，two，3等添加相同的值。这是怎么回事？我不知道为什么会这样。任何帮助都会很棒！