手写数组去重
1 Set 1 2 3 const uniq = (arr) => Array.from(new Set(arr)) // or const uniq = (arr) => [...new Set(arr)] 2 计数排序 1 2 3 4 5 6 7 8 9 10 11 const uniq = (arr) => { if(!arr.length) return [] const map = {} for(let i = 0; i <= arr.length; i++) { if(!arr[i] || map[arr[i]]) continue // 利用对象中k