js数组排列

抽象问题：你面前有n个筐，每一个筐都放着不一样数量的不一样物品，让你在每一个筐中拿一个物品，请问一共有多少可能，分别是什么？

function combine(twoDimensionalArr) {

//二维数组中每一个数组的最大长度
var maxLengthArr = [];
//遍历过程当中每一个数组的下标
var tempIndexArr = [];
for (var i = 0; i < twoDimensionalArr.length; i++) {
	maxLengthArr.push(twoDimensionalArr[i].length);
	tempIndexArr.push(0);
}
//组合一共有多少种
var count = 1;
for (var i = 0; i < maxLengthArr.length; i++) {
	count = count * maxLengthArr[i];
}

var combineValues = [];
var combineItem;
for (var i = 0; i < count; i++) {
	if (i !== 0) {
		var changeIndex = tempIndexArr.length - 1;
		var sholdAdd = false;
		while (!sholdAdd) {
			tempIndexArr[changeIndex] += 1;
			if (tempIndexArr[changeIndex] >= maxLengthArr[changeIndex]) {
				tempIndexArr[changeIndex--] = 0;
				sholdAdd = false;
			} else {
				sholdAdd = true
			}
		}
	}

	combineItem = [];
	for (var j = 0; j < tempIndexArr.length; j++) {
		combineItem.push(twoDimensionalArr[j][tempIndexArr[j]]);
	}
	combineValues.push(combineItem);
}
console.log(combineValues);
return combineValues;
}


combine([[1,2,3],["a","b","c","d"],["A","B"]]);`