JS 笛卡尔积 算法

function calcDescartes (array) {
    if (array.length < 2) return array[0] || [];
    return [].reduce.call(array, function (col, set) {
        var res = [];
        col.forEach(function (c) {
            set.forEach(function (s) {
                var t = [].concat(Array.isArray(c) ? c : [c]);
                t.push(s);
                res.push(t);
            })
        });
        return res;
    });
}

console.log(calcDescartes([[1,2,3],['a','b','c']]));

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