function SplitArray(list, sp) {
	if (typeof list != 'object') return [];
	if (sp === undefined) sp = [];
	for (var i = 0; i < list.length; i++) {
		sp.push(list[i]);
	}
	return sp;
}
console.log(SplitArray([1,2],[3,4]))	//[3, 4, 1, 2]