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')
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