vue怎样实现树形菜单

                                                                *{                color:#585858;                     }            #app{                min-height:  650px;            }            #app li{                list-style-type:none;            }            #app a{                text-decoration:none;            }            #app button{                width:100%;            }            #app ul{                padding:10px;            }            #app span{                cursor:pointer;            }            #tree{                border: 1px solid #ccc;                            min-height:  650px;                width: 50%;                margin:0;                padding-top: 10px;                background-color:#f2f2f2;                position: absolute;                top:0;                left:0;            }                       #tree  li {                display: block;                padding: 0;                margin: 0;                border: 0;                border-bottom: 1px solid #e5e5e5;                min-height: 32px;                line-height:32px;            }                        
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                       {{ tree[i].open ? '-' : '+' }}                    {{v.city}}                                        
            
                                var data = [{"id":26,"pid":1,"city":"四川省"},{"id":30,"pid":1,"city":"云南省"},{"id":322,"pid":26,"city":"成都"},{"id":323,"pid":26,"city":"绵阳"},{"id":324,"pid":26,"city":"阿坝"},{"id":325,"pid":26,"city":"巴中"},{"id":326,"pid":26,"city":"达州"},{"id":327,"pid":26,"city":"德阳"},{"id":328,"pid":26,"city":"甘孜"},{"id":329,"pid":26,"city":"广安"},{"id":330,"pid":26,"city":"广元"},{"id":331,"pid":26,"city":"乐山"},{"id":332,"pid":26,"city":"凉山"},{"id":333,"pid":26,"city":"眉山"},{"id":334,"pid":26,"city":"南充"},{"id":335,"pid":26,"city":"内江"},{"id":336,"pid":26,"city":"攀枝花"},{"id":337,"pid":26,"city":"遂宁"},{"id":338,"pid":26,"city":"雅安"},{"id":339,"pid":26,"city":"宜宾"},{"id":340,"pid":26,"city":"资阳"},{"id":341,"pid":26,"city":"自贡"},{"id":342,"pid":26,"city":"泸州"},{"id":367,"pid":30,"city":"昆明"},{"id":378,"pid":30,"city":"曲靖"},{"id":3100,"pid":367,"city":"盘龙区"},{"id":3101,"pid":367,"city":"五华区"},{"id":3102,"pid":367,"city":"官渡区"},{"id":3103,"pid":367,"city":"西山区"},{"id":3104,"pid":367,"city":"东川区"},{"id":3105,"pid":367,"city":"安宁市"},{"id":3106,"pid":367,"city":"呈贡县"},{"id":3107,"pid":367,"city":"晋宁县"},{"id":3108,"pid":367,"city":"富民县"},{"id":3109,"pid":367,"city":"宜良县"},{"id":3110,"pid":367,"city":"嵩明县"},{"id":3111,"pid":367,"city":"石林县"},{"id":3112,"pid":367,"city":"禄劝"},{"id":3113,"pid":367,"city":"寻甸"},{"id":3189,"pid":378,"city":"麒麟区"},{"id":3190,"pid":378,"city":"宣威市"},{"id":3191,"pid":378,"city":"马龙县"},{"id":3192,"pid":378,"city":"陆良县"},{"id":3193,"pid":378,"city":"师宗县"},{"id":3194,"pid":378,"city":"罗平县"},{"id":3195,"pid":378,"city":"富源县"},{"id":3196,"pid":378,"city":"会泽县"},{"id":3197,"pid":378,"city":"沾益县"}];            var treeData = createTree({                idname:'id',                pidname:'pid',                rootid:1,                data:data            });            function createTree(arg){                var idname = arg.idname,                    pidname = arg.pidname,                    rootid = arg.rootid,                    data = arg.data,                    treeData = [];                var _createTree = function(id){                    var ret = [];                      var index = 0;                    for(var i = 0; i < data.length; i++){                                        if(data[i][pidname] == id){                            ret[index] = data[i];                            ret[index].child = _createTree(data[i][idname]);                            index++;                        }                      }                    return ret;                }                var index = 0;                for(var i = 0; i < data.length; i++){                               if(data[i][pidname] == rootid){                       treeData[index] = data[i];                       treeData[index].child = _createTree(data[i][idname]);                       index++;                   }                     }                return treeData;            }            Vue.component('item', {                template: '#tree-template',                props: ['tree'],                data: function () {                    return {}                },                methods: {                    toggle: function (i) {                        this.tree[i].open = !this.tree[i].open;                        this.$set(this.tree, i, this.tree[i]);                    },                    isFolder: function (data) {                        return data.child && data.child.length                    },                },            })            var vm = new Vue({                el: '#app',                data: {                    treeData: treeData,                    show:false,                },                methods: {                    hideTree:function(e){                        if(e.target.id == 'app'){                            console.log(137);                            this.show = false;                        }                    }                },                created: function () {                    function _addOpen(data) {                        for (var i = 0; i  0) {                                _addOpen(data[i].child);                            }                        }                    }                    _addOpen(this.treeData);                }            });            

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