js 数组怎么去掉一级

Question

var aa = [{a:1,b:1,c:[{aa:1},{bb:1},{cc:1}]},{a:2,b:2,c:[{dd:2},{ee:2},{ff:2}]}]结果console.log([{aa:1},{bb:1},{cc:1},{dd:2},{ee:2},{ff:2}])

Answer 1

var aa = [{a:1,b:1,c:[{aa:1},{bb:1},{cc:1}]},{a:2,b:2,c:[{dd:2},{ee:2},{ff:2}]}];

var arr = [];

for(var a in aa)

    arr.push(aa[a].c);

console.log(arr);

Answer 2

function filter(arr){

    var ret = [];

    for(var i=0; i<arr.length; i++){

        if(arr[i].c){

            ret = ret.concat(arr[i].c);

        }

    }

    return ret;

}