js 数组 骚操作

function split_array(arr, len) {

    let a_len = arr.length;

    let result = ;

    for (let i = 0; i < a_len; i += len) {

        result.push(arr.slice(i, i + len));

    }

    return result;

}

[...array].join(',').split(',')

[...new Set([...array])]

            var getJsonTree = function(data, parentId,Id) {

                var itemArr = ;

                for(var i = 0; i < data.length; i++) {

                    var node = data[i];

                    if(node.ParentSituationId == parentId) {

                        var newNode = {}

                        for(key in node) {

                            newNode[key] = node[key]

                        }

                        newNode.SituationMaterialRelationshipList = getJsonTree(data, node.Id)

                        itemArr.push(newNode);

                    }

                }

                return itemArr;

            }