const arr = [1, 5, '5', 'a','c','a' true, true, false, false, 'true', 'a...

數(shù)組扁平化：輸入：const data = [ 1,2 ,[3,4,6,8],[1,2,[2]]];輸出：[1,2,3,4,6,8,1,2,2...