数组扁平化

const data = [1, [2, [3, [4, 5]]]];

let newArr = []

function isOnedimensionArray(arr){
    arr.forEach((item)=>{
        if(Array.isArray(item)){
            isOnedimensionArray(item)
        }else{
            newArr.push(item)
        }
    })
}

isOnedimensionArray(data)

console.log(newArr,'newArray')

输出:

(5) [1, 2, 3, 4, 5]0: 11: 22: 33: 44: 5length: 5[[Prototype]]: Array(0) 'newArray'