两个小思路： let arr = [1,2,3,[1,2,3],[2,[3,4],3]] function flatteningToArr1(arr) { let str = JSON.stringify(arr) let matchReg = /[\[\]]/g function replaceHandle(p, offset) { if (offset != 0 && offset != str.length - 1) return '' else return p } return JSON.parse(str.replace(matchReg, replaceHandle)) } function flatteningToArr2(data) { let ans = [] return function f1(arr) { arr.forEach(ele => { if (ele instanceof Array) { f1(ele) } else { ans.push(ele) } }) return ans }(data) } console.log(flatteningToArr1(arr)) console.log(flatteningToArr2(arr))