vue 实现的树形菜的实例代码

这篇文章主要介绍了vue 实现的树形菜单,需要的朋友可以参考下

下面一段代码给大家介绍vue 实现的树形菜单功能，具体代码如下所示：

nbsp;html>                                *{        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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