js实现排列组合

function GetDataList(keys){
    // 保存生成的组合
    let newObj = {};

    if (keys.length === 0) {
        return newObj;
    }
    // 基础功能
    function queue(arr, size) {
        if (size > arr.length) { return; }
        var allResult = [];
    
        (function (arr, size, result) {
            if (result.length == size) {
                allResult.push(result);
            } else {
                for (var i = 0, len = arr.length; i < len; i++) {
                    var newArr = [].concat(arr);
                    var curItem = newArr.splice(i, 1);
                    arguments.callee(newArr, size, [].concat(result, curItem));
                }
            }
        })(arr, size, []);
    
        return allResult;
    }

    for (let i=keys.length;i>0;i--) {
        let newArr = queue(keys,i);
        newObj[i] = newArr;
    }
    console.log(newObj);
};

GetDataList(['鸡肉','酸奶','排骨']);