如果不完全知道屬性名稱，如何訪問屬性？

Question

如果在 Javascript 中不完全知道屬性名稱，如何在 javascript 中訪問對象的屬性？ 需要通過知道“totalCount”將是屬性名稱的一部分來訪問值。 樣本

{
  {"totalCount_12":100},
  {"totalCount_13":100},
  {"totalCount_2":100}
}

Answer 1

我希望這段代碼能幫助你

a = {"totalCount_12":100}
a[Object.keys(a).filter(i=>i.includes("totalCount"))[0]]

Answer 2

您可以通過創建一個查找'totalCount_'+n （n 是給定數字）的特殊函數來實現這一點

const list = [
  {"totalCount_12":75},
  {"totalCount_13":100},
  {"totalCount_2":150},
  {"totalCount_14":17}
]

const findByPartlyKnownName = (n) => list.find(el => Object.keys(el)[0].includes(`totalCount_${n}`))

console.log(findByPartlyKnownName(12))
console.log(findByPartlyKnownName(14))
console.log(findByPartlyKnownName(2))