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：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>vue</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="animate.css" rel="external nofollow" >
<script src="vue.js"></script>
<style>
*{
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;
}
</style>
</head>
<body>
<div id='app' @click='hideTree($event)'>
<button @click.stop="show = !show">点我</button>
<transition enter-active-class="animated fadeInLeft" leave-active-class="animated fadeOutLeft">
<item v-bind:tree='treeData' id='tree' v-if="show"></item>
</transition>
</div>
<template id='tree-template'>
<ul>
<li v-for='(v,i) in tree'>
<span v-if="isFolder(v)" @click="toggle(i)">{{ tree[i].open ? '-' : '+' }}</span>
<a data-id="v.id">{{v.city}}</a>
<item v-bind:tree='v.child' v-show="tree[i].open"></item>
</li>
</ul>
</template>
<script>
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"}];
