js
// 拍平数组
function myFlat(arr, depth = 1){
// 结束递归
if(depth < 1){
return arr;
}
let res = [];
arr.forEach(element => {
if(Array.isArray(element)){
// 如果元素是数组
res = res.concat(myFlat(element, depth - 1)); // 递归
}else{
res.push(element);
}
});
return res;
}
let nums = [1,2,[3,4,[6, 7]],5];
console.log(myFlat(nums, 2));