js+html菜单栏折叠，支持数据无限嵌套

<style>
        html {
            height: 100%;
        }

        body {
            width: 100%;
            height: 100%;
            margin: 0;
            padding: 0;
        }

        ul,
        li {
            margin: 0;
            padding: 0;
            list-style: none;
        }

        .select {
            width: 300px;
            padding: 10px;
            background: #eee;
            height: 100%;
        }

        .selectUl li a {
            width: 100%;
            display: block;
            color: #333;
            padding: 5px 0;
            text-decoration: none;
            /* margin: 0; */
            /* height: 30px;
            line-height: 30px; */
            /* cursor: pointer;
            background: #fff; */
        }

        /* .selectUl li:hover {
            background: #ddd;
        } */

        .selectUl li .accordion {
            padding-left: 10px;
            display: none;
        }

        .imgs {
            height: 10px;
            width: 10px;
        }

        .block {
            display: block !important;
        }
    </style>

 <div class="select" id="selectId">

    </div>

<script>
    var list = [
        {
            id: 1,
            name: '测试',
            children: [
                {
                    id: 11,
                    name: '测试1',
                    children: [
                        {
                            id: 112,
                            name: 'cs1'
                        }
                    ]
                },
                {
                    id: 12,
                    name: '测试2'
                }
            ]
        },
        {
            id: 2,
            name: '测试2',
            children: [
                {
                    id: 21,
                    name: '测试1'
                },
                {
                    id: 12,
                    name: '测试2',
                    children: [
                        {
                            id: 112,
                            name: 'cs1',
                            children: [
                                {
                                    id: 112,
                                    name: 'csdsfsdfsd1'
                                }
                            ]
                        },
                        {
                            id: 113,
                            name: 'csdfg',

                        }
                    ]
                }
            ]
        }
    ]

    var select = (function () {
        Select.config= {};
        Select.run = function (array, config) {
            Select.config = config;
            var selectId = document.getElementById(Select.config.id);
            selectId.appendChild(Select.render(array));
            Select.load();
        }

        Select.render = function (array) {
            if (!Array.isArray(array) || array.length <= 0) { return "" }
            var div = Select.CreatElement('div');
            array.forEach(function (item, i) {
                var span = Select.CreatElement('span');
                var ul = Select.CreatElement('ul');
                var li = Select.CreatElement('li');
                var a = Select.CreatElement('a');
                var img = Select.CreatElement('img');
                span.innerHTML = item.name;
                if (item.children) {
                    a.appendChild(img);
                } else {
                    a.onclick = function () {
                        Select.config.callBack(item.id)
                    }
                }

                a.appendChild(span);
                li.id = item.id;
                li.appendChild(a);
                if (item.children) {
                    li.appendChild(Select.render(item.children));
                }
                ul.appendChild(li);
                div.appendChild(ul);
            });
            return div;
        }

        Select.CreatElement = function (e) {
            var eve = document.createElement(e);
            switch (e) {
                case 'ul':
                    eve.className = 'selectUl';
                    break;
                case 'li':
                    eve.className = 'selectLi';
                    break;
                case 'div':
                    eve.className = 'accordion';
                    break;
                case 'img':
                    eve.className = 'imgs';
                    eve.src = './right.png';
                    break;
                case 'a':
                    eve.className = 'selectImg';
                    eve.href = "javascript:;";
                    break;
            }
            return eve;
        }

        Select.load = function () {
            var selectA = document.getElementsByClassName('selectLi');
            for (let a of selectA) {
                a.addEventListener('click', Select.AddEvtListener, false);
            }
        }

        Select.AddEvtListener = function (e) {
            e.stopPropagation();
            var obox = this.children;
            var img = obox[0].getElementsByClassName('imgs')[0];
            if (obox[1]) {
                if (obox[1].classList.contains('block')) {
                    obox[1].classList.remove('block');
                    img.src = Select.config.iocn1;
                } else {
                    obox[1].classList.add('block');
                    img.src = Select.config.iocn2;
                }
            }
        }

        function Select() { };

        // for nodejs
        if (typeof module === "object" && typeof module.exports === "object") {
            module.exports = Select;
        }

        return Select;
    })();

    var config = {
        id:'selectId',
        iocn1:'./right.png',
        iocn2:'./down.png',
        callBack:callBack,
    }
    select.run(list, config);

    function callBack(e) {
        console.log(e)
    }
</script>