二维数组里面的元素排列组合

var arrays = [[1,2,3],['a','b'],['你','我']];
console.log(getArrays(arrays))
//["1a你", "1a我", "1b你", "1b我", "2a你", "2a我", "2b你", "2b我", "3a你", "3a我", "3b你", "3b我"]

function getArrays(arrays){
	var arr = [""];
	arrays.forEach((item,idx) => {
		arr = getValues(arr,item);
	})
	return arr;
}

function getValues(arr1,arr2){
	var arr = [];
	arr1.forEach((item,index) => {
		arr2.forEach((opt,idx) => {
			arr.push(item+opt);
		})
	})
	return arr;
}