In an array, objects are de-duplicated

// The first way

removalRepeat (arr, uniqueKey) { let map = new Map() for (let i of arr) { if (! map.has(i[uniqueKey])) { map.set(i[uniqueKey], i) } } arr = [...map.values()] return arr }

/ / call this removalRepeat (res. Result. The list, ‘id’)

/ / the second

NewList = newlist.reduce ((preVal, CurVal) => {// provinceId = obj[curval.provinceid]? '' : (obj[curVal.provinceId] = true && preVal.push(curVal)) return preVal }, [])