js遍历数组并以特定形式展示

    var arr = [{
            name: '1',
            children: [{
                    name: 2,
                    children: []
                },
                {
                    name: 3,
                    children: [{
                        name: 4,
                        children: [{
                            name: 5,
                            children: []
                        }]
                    }]
                },
            ]
        }]
        var newArr = [];
        var parentName = null;
        function fn(arr) {
            for (var i = 0; i < arr.length; i++) {
                if (arr[i].children.length !== 0) {
                    newArr.push({
                        name: arr[i].name,
                        parentName: parentName
                    })
                    parentName = arr[i].name
                    fn(arr[i].children)
                } else {
                    newArr.push({
                        name: arr[i].name,
                        parentName: parentName
                    })
                }
            }
        }
        fn(arr)
        console.log(newArr);