1.单个数组的去重
Array.from(new Set(arr))
2.多个数组去重 返回不同数据展示
let a = [1, 2, 3, 4]
let b = [3, 4, 5]
let union = [...new Set([...a, ...b])]
console.log(union)
3.单个数组对象去重
let b = [{ id: '4', result: '第三' }, { id: '2', result: '第四' }, { id: '2', result: '第二' }]
let d = []
let hash = {}
d = b.reduce((item, next) => {
hash[next.id] ? '' : hash[next.id] = true && item.push(next)
return item
}, [])
console.log(d, '看看看')
4.多个数组对象去重
let jsonArray = [{ id: '1', result: '第一' }, { id: '2', result: '第二' }]
let b = [{ id: '4', result: '第三' }, { id: '3', result: '第四' }, { id: '2', result: '第二' }]
let c = [...jsonArray, ...b] //两个数组合并一个的简单方法
let d = []
let hash = {}
d = c.reduce((item, next) => {
hash[next.id] ? '' : hash[next.id] = true && item.push(next)
return item
}, [])
console.log(d, '看看看')