shigaofanfanflat/index.js

测试

function myflat(array) {
    let newArr = [];

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

let arr = [1, 2, {},
    [4, 5, [6, [7]]]
]
console.log(myflat(arr));