將多層數(shù)組變成一層
flatten([0, [1, 2], 3]); //[0, 1, 2, 3]
flatten([{a: 1}, [1, [2, 3]], 4]); //[{a: 1}, 1, 2, 3, 4]
請(qǐng)實(shí)現(xiàn)flatten函數(shù)，注意參數(shù)數(shù)組的元素不一定只是數(shù)字，可能是字符串或者對(duì)象等
console.log(flatten([0,[1,2,3],4]))
console.log(flatten([{a: 1}, [1, [2, [{b: 0, c: [1]}, [5, [8, [9]]]]]], 4]));

function flatten(some) {
    let  result = [];
    let loop = function (param) {
        let  res = [];
        if (Array.isArray(param)) {
            const tmp = Object.assign([], param);
            tmp.forEach(item => {
                 if (!Array.isArray(item)) {
                     res.push(item) ;
                 } else {
                     for (let element of item) {
                          res = [...res,...loop(element)]
                     }
                 }
             })
        } else {
            res.push(param)
        }
        return res;
    }
    result = loop(some);   
    return result
}