JS二維數組排序組合

現在有一個不確定長度的數組.
比如:
var temp=[
["Fu","Hai","Huan"],
["Wei","You"],
["Chong","Tong","Zhong"]
];
每一個數組的長計都不確定  ,
如何 遍歷這個數組
得到如: FuWeiChong ,FuWeiTong
這樣的數據

function doExchange(doubleArrays){
    var len=doubleArrays.length;
    if(len>=2){
        var len1=doubleArrays[0].length;
        var len2=doubleArrays[1].length;
        var newlen=len1*len2;
        var temp=new Array(newlen);
        var index=0;
        for(var i=0;i<len1;i++){
            for(var j=0;j<len2;j++){
                temp[index]=doubleArrays[0][i]+
                    doubleArrays[1][j];
                index++;
            }
        }
        var newArray=new Array(len-1);
        for(var i=2;i<len;i++){
            newArray[i-1]= doubleArrays[i];
        }
        newArray[0]=temp;
        return doExchange(newArray);
    }
    else{
        return doubleArrays[0];
    }
}

1 var temparr=[
2         ["Fu","Hai","Huan"],
3         ["Wei","You"],
4         ["Chong","Tong","Zhong"]];
5     var ret = doExchange(temparr);
6     console.log("共有：" + ret.length + "種組合！");
7     for (var i = 0; i < ret.length; i++) {
8         console.log(ret[i]);
9     }