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小編給大家分享一下vue如何實現的樹形菜，相信大部分人都還不怎么了解，因此分享這篇文章給大家參考一下，希望大家閱讀完這篇文章后大有收獲，下面讓我們一起去了解一下吧！
具體代碼如下所示：
<!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">點我</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":"綿陽"},{"id":324,"pid":26,"city":"阿壩"},{"id":325,"pid":26,"city":"巴中"},{"id":326,"pid":26,"city":"達州"},{"id":327,"pid":26,"city":"德陽"},{"id":328,"pid":26,"city":"甘孜"},{"id":329,"pid":26,"city":"廣安"},{"id":330,"pid":26,"city":"廣元"},{"id":331,"pid":26,"city":"樂山"},{"id":332,"pid":26,"city":"涼山"},{"id":333,"pid":26,"city":"眉山"},{"id":334,"pid":26,"city":"南充"},{"id":335,"pid":26,"city":"內江"},{"id":336,"pid":26,"city":"攀枝花"},{"id":337,"pid":26,"city":"遂寧"},{"id":338,"pid":26,"city":"雅安"},{"id":339,"pid":26,"city":"宜賓"},{"id":340,"pid":26,"city":"資陽"},{"id":341,"pid":26,"city":"自貢"},{"id":342,"pid":26,"city":"瀘州"},{"id":367,"pid":30,"city":"昆明"},{"id":378,"pid":30,"city":"曲靖"},{"id":3100,"pid":367,"city":"盤龍區"},{"id":3101,"pid":367,"city":"五華區"},{"id":3102,"pid":367,"city":"官渡區"},{"id":3103,"pid":367,"city":"西山區"},{"id":3104,"pid":367,"city":"東川區"},{"id":3105,"pid":367,"city":"安寧市"},{"id":3106,"pid":367,"city":"呈貢縣"},{"id":3107,"pid":367,"city":"晉寧縣"},{"id":3108,"pid":367,"city":"富民縣"},{"id":3109,"pid":367,"city":"宜良縣"},{"id":3110,"pid":367,"city":"嵩明縣"},{"id":3111,"pid":367,"city":"石林縣"},{"id":3112,"pid":367,"city":"祿勸"},{"id":3113,"pid":367,"city":"尋甸"},{"id":3189,"pid":378,"city":"麒麟區"},{"id":3190,"pid":378,"city":"宣威市"},{"id":3191,"pid":378,"city":"馬龍縣"},{"id":3192,"pid":378,"city":"陸良縣"},{"id":3193,"pid":378,"city":"師宗縣"},{"id":3194,"pid":378,"city":"羅平縣"},{"id":3195,"pid":378,"city":"富源縣"},{"id":3196,"pid":378,"city":"會澤縣"},{"id":3197,"pid":378,"city":"沾益縣"}];
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 < data.length; i++) {
data[i]['open'] = false;
if (data[i].child.length > 0) {
_addOpen(data[i].child);
}
}
}
_addOpen(this.treeData);
}
});
</script>
</body>
</html>Vue具體輕量級框架、簡單易學、雙向數據綁定、組件化、數據和結構的分離、虛擬DOM、運行速度快等優勢，Vue中頁面使用的是局部刷新，不用每次跳轉頁面都要請求所有數據和dom，可以大大提升訪問速度和用戶體驗。
以上是“vue如何實現的樹形菜”這篇文章的所有內容，感謝各位的閱讀！相信大家都有了一定的了解，希望分享的內容對大家有所幫助，如果還想學習更多知識，歡迎關注億速云行業資訊頻道！
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