JS使用循环获得不定维度笛卡尔积

Posted 2020-06-16

使用循环获得不定维度笛卡尔积：

参考http://blog.csdn.net/buptdavid/article/details/45918647改造

function testing()
            {
                var d = [
                    ["a1", "a2", "a3"],
                    ["b1", "b2"],
                    ["c1", "c2", "c3", "c4"],
                    ["d1", "d2", "d3", "d4", "d5"],
                    ["e1", "e2", "e3", "e4", "e5","e6"],
                ];
                var total = 1;
                for (var i = 0; i < d.length; i++)
                {
                    total *= d[i].length;
                }
                var e = [];
                var itemLoopNum = 1;
                var loopPerItem = 1;
                var now = 1;
                for (var i = 0; i < d.length; i++) {
                    now *= d[i].length;
                    var index = 0;
                    var currentSize = d[i].length;
                    itemLoopNum = total / now;
                    loopPerItem = total / (itemLoopNum * currentSize);
                    var myIndex = 0;
                    for (var j = 0; j < d[i].length; j++)
                    {
                        for (var z = 0 ; z < loopPerItem; z++)
                        {
                            if (myIndex == d[i].length) {
                                myIndex = 0;
                            }
                            for (var k = 0; k < itemLoopNum; k++)
                            {
                                e[index] = (e[index] == null ? "" :e[index] + ",") + d[i][myIndex];
                                index++;
                            }
                            myIndex++
                        }
                    }
                }
                for (var l = 0; l < e.length; l++)
                {
                    console.log(e[l]);
                }
            }