js 多维数组转为一维数组

var arr = [1, 2, [3, 4, [5, 6, 7]]];
var resultArr = [];
function forEachArr(arr) {
    for (var i = 0; i < arr.length; i++) {
        if (arr[i] instanceof Array) {
            arguments.callee(arr[i]);
//            forEachArr(arr[i]);
        } else {
            resultArr.push(arr[i]);
        }
    }
    return resultArr;
}
console.log(forEachArr(arr));