(精华)2020年6月28日 JavaScript高级篇 侧边栏目录树

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>无限极目录树</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        ul,
        li {
            list-style-type: none;
        }

        .toShow {
            display: none;
        }

        .first-menu>.item {
            width: 250px;
        }

        .first-menu .item {

            line-height: 35px;
            background: orange;
            margin-bottom: 1px;
            overflow-x: hidden;
            margin-top: 1px;
            cursor: pointer;

        }

        .first-menu .item b {
            display: block;
            position: relative;
        }

        .first-menu .item b:after {
            content: '>';
            position: absolute;
            right: 10px;
            top: 0px;
            color: #fff;
            font-size: 16px;
            font-weight: normal;
        }

        .first-menu .item ul li {
            background: powderblue;
            box-sizing: border-box;
            padding-left: 30px;
            ;
        }
    </style>
</head>

<body>
    <div class="box-menu dl" id="boxMenu">
    </div>
    <script>
        var classTool = {
            hasClass: function (elem, cls) {
                // /toShow/.test(elem.className) //常用
                return new RegExp(cls).test(elem.className);
            },
            addClass: function (elem, cls) {
                if (!this.hasClass(elem, cls)) {
                    elem.className += " " + cls;
                }
            },
            removeClass: function (elem, cls) {
                if (this.hasClass(elem, cls)) {
                    var reg = new RegExp('(\\s|^)' + cls + '(\\s|$)');
                    elem.className = elem.className.replace(reg, ' ');
                }
            },
            toggleClass(elem, cls) {
                if (this.hasClass(elem, cls)) {
                    this.removeClass(elem, cls);
                } else {
                    this.addClass(elem, cls);
                }
            }
        }

        // 解决classList的兼容问题(ie9及以下)
        var isClassList = 'classList' in HTMLElement.prototype;
        if (!isClassList) {
            Object.defineProperty(HTMLElement.prototype, 'classList', {
                get: function () {
                    var _self = this;
                    var hasClass = function (cls) {
                        return new RegExp(cls).test(_self.className);
                    }
                    return {
                        add: function (cls) {
                            if (!this.contains(cls)) {
                                // if(!hasClass(cls)) {
                                _self.className += " " + cls;
                            }
                        },
                        contains: function (cls) {
                            var index = _self.className.indexOf(cls);
                            return index != -1 ? true : false;
                        },
                        remove: function (cls) {
                            if (!this.contains(cls)) {
                                var reg = new RegExp('(\\s|^)' + cls + '(\\s|$)');
                                _self.className = _self.className.replace(reg, '');
                            }
                        },
                        toggle: function (cls) {
                            if (!this.contains(cls)) {
                                this.remove(cls);
                            } else {
                                this.add(cls);
                            }
                        }
                    }
                }
            })
        }
        var menudata = [{
                name: 'AAA',
                child: [{
                        name: 'a1',
                        child: [{
                            name: 'a1-1'
                        }, {
                            name: 'a1-2'
                        }]
                    },
                    {
                        name: 'a2'
                    },
                    {
                        name: 'a3',
                        child: [{
                            name: 'a3-1'
                        }, {
                            name: 'a3-2',
                            child: [{
                                name: 'a3-2-1'
                            }, {
                                name: 'a3-2-2'
                            }]
                        }]
                    }
                ]
            },
            {
                name: 'BBB',
                child: [{
                    name: 'b1'
                }, {
                    name: 'b2'
                }, {
                    name: 'b3'
                }]
            },
            {
                name: 'CCC',
                child: [{
                    name: 'c1'
                }]
            },
            {
                name: 'DDD'
            }
        ];
        //1.拼接目录树
        //2.渲染到dom节点
        //3.添加点击事件

        var objTree = {
            // boxMenu
            init(el, data) {
                //2.渲染到dom节点
                this.elDom = document.getElementById(el);
                this.elDom.innerHTML = this.createTree(data, true);
                this.clickFun();

            },
            createTree(data, isFirst) {
                //1.拼接目录树
                var mtr = isFirst ? '
    ' : '
      '; for (var i = 0, len = data.length; i < len; i++) { if (data[i].child && data[i].child.length > 0) { // mtr +='
    • '+data[i].name+''; mtr += '
    • ' + data[i].name; mtr += this.createTree(data[i].child, false); mtr += '
    • '
      ; } else { mtr += '
    • ' + data[i].name + '
    • '
      } } mtr += '
    '
    return mtr; }, clickFun() { this.elDom.addEventListener('click', function (ev) { ev.stopPropagation(); //阻止事件冒泡 // ev.preventDefault(); var target = ev.target; var firstE = target.firstElementChild; if (firstE) { var operate = /toShow/.test(firstE.className) ? 'remove' : 'add'; firstE.classList[operate]('toShow'); } }, false); } } objTree.init('boxMenu', menudata); </script> </body> </html>

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