整理---产品对比处理JSON

//参考海外
function formatProCompareJson(arr, flag) {
    //const _arr=arr;
    var _arr = JSON.parse(JSON.stringify(arr));
    var len = _arr.length;
    //var r=Object.assign({}, _arr[0]);
    var r = _arr[0];
    var _o = new Array();
//使用for(var i in len)循环数组时，在ie8下会报错，
    for (var i = 1; i < len; i++) {
        _o = _arr[i];
        for (var n in r) {
            if (n in _o) {
                for (var k in r[n]) { //小组
                    if (!(k in _o[n])) {
                        _o[n][k] = '';
                    }
                }
            } else {
                _o[n] = {};
                for (var k in r[n]) { //小组
                    _o[n][k] = ''
                }
            }
        }

        for (var j in _o) { //大组
            if (j in r) {
                for (var k in _o[j]) { //小组
                    r[j][k] = k in r[j] ? additems(r[j][k], _o[j][k] || "", true) : additems(i, _o[j][k] || "", true)
                }
            } else {
                r[j] = {};
                for (var k in _o[j]) { //小组
                    r[j][k] = k in r[j] ? additems(r[j][k], _o[j][k] || "", true) : additems(i, _o[j][k] || "", true)
                }
            }
        }
    }

    for (var i in r) { //最后过滤
        for (var j in r[i]) {
            var _r = r[i][j];
            if (typeof (_r) == "string") {
                r[i][j] = additems(len, _r, false);
            }
            //清理空元素
            if (isAllEqual(_r) && _r[0] === "") delete r[i][j];
        }
        if ($.isEmptyObject(r[i])) delete r[i];
    }

    return r;
    //
    function additems(item, str, _flag) {
        var _A = [];
        if (_flag) {
            if (typeof (item) == "string") {
                _A = [delallicon(item)];
            } else if (typeof (item) == "number") {
                for (var i = 0; i < item; i++) {
                    _A[i] = "";
                }
            } else {
                _A = item;
            }
            _A.push(delallicon(str));
        } else {
            _A.push(delallicon(str));
            for (var i = 1; i < item; i++) {
                _A[i] = "";
            }
        }
        return _A;
    }
    //判断数组元素是否相等
    function isAllEqual(array) {
        if (array.length > 0 && typeof (array) == "object") {
            return !array.some(function (value, index) {
                return value !== array[0];
            });
        } else {
            return true;
        }
    }
    //删除多余逗号
    function delallicon(str) {
        s = $.trim(str);
        s = s.replace(/^\,{1,}/, "");
        s = s.replace(/\,{1,}$/, "");
        s = s.replace(/\,{2,}/g, ",");
        return s;
    }
}