JS怎么实现将一维数组转换成二维数组？

Question

比如
arr1 = [2,2,2,5,5,6,6,6,6,7];
按相同拆分
想得到
arr2 = [[2,2,2],[5,5],[6,6,6，6],[7]];

Answer 1

let arr1 = [2,2,2,5,5,6,6,6,6,7]; function trans (arr) { let pre = NaN let result = [] let curArr arr.forEach(cur => { if (cur === pre) { curArr.push(cur) } else { curArr = [cur] result.push(curArr) pre = cur } }) return result } trans(arr1)

Answer 2

[2,2,2,5,5,6,6,6,6,7] .reduce((m,n) => (m[n] = (m[n] || []).concat(n), m),[]) .filter(a => a)

Answer 3

你的一维数组是否已经排好序？如果已经排好，处理比较简单，否则会比较麻烦。