javascript - vue新手求助。v-for和v-if在同级渲染出多个元素，如何单独更改其中一个元素的显示/隐藏
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问题描述
问 题
在自制一个能增删改的todolist练手，模仿www.todolist.cn，做到重新编辑todo内容时卡住了，在官方没总结出解决方案，所以在这里求助。以下。
点击文字变成input修改，但效果是这样的
因为我v-if绑定的是同一个变量，所以肯定会全局改掉，但对vue的理解太浅，想不到有效的办法。
代码：`<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>NBtodoList</title>
<link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
<script src="https://cdn.bootcss.com/vue/2.3.3/vue.min.js"></script>
<style>
body{
background: #CDCDCD;
}
header{
height: 50px;
line-height: 50px;
background: #323232;
}
.headerForm label{
color: #DDDDDD;
font-size: 20px;
cursor: pointer;;
}
.headerForm input{
margin-top: 8px;
}
.h2{
font-weight: bold;
margin: 20px 0;
}
section{
}
li,ul,ol{
list-style: none;
}
.oLi{
height: 40px;
background: #fff;
border-radius: 5px;
line-height: 40px;
border-left: 5px solid #629A9C;
margin-bottom: 10px;
}
.oLi .check{
width: 22px;
height: 22px;
margin: 9px;
}
.oLi p{
height: 40px;
}
.oLi *{
padding: 0;
}
.oLi i{
text-align: center;
line-height: 40px;
font-size: 18px;
}
.oLi span{
cursor: pointer;
}
.oLi .txt{
line-height: 50px;
display: inline-block;
padding-left: 5px;
}
ul{
padding-left: 0;
}
</style></head>
<body>
<div id="app">
<header class="container-fluid">
<div class="container">
<div class="headerForm form-group center-block clearfix">
<label for="todocontent" class="pull-left col-xs-3">ToDoList</label>
<div class="col-xs-9 pull-right">
<input autofocus type="text" id="todocontent" class="form-control" v-model='todoText' v-on:keyup.enter='addTodo' placeholder="添加ToDo">
</div>
</div>
</div>
</header>
<section class="container">
<div class="center-block" style="padding: 0 15px">
<my-h2 v-bind:num='noNum' status='正在进行'></my-h2>
<ul>
<my-li v-for='(todo,index) in todoList' v-bind:to='todo' v-on:deltodo='deltodos(index)' v-on:todook='dotoDown(index)' v-on:childrevamp="revamp" v-bind:childisrevamp="isRevamp"></my-li>
</ul>
<my-h2 v-bind:num='okNum' status='已经完成'></my-h2>
<ul>
<my-li style="opacity: .5" v-for='(oktodo,index) in oktodoList' v-bind:childchecked="checked" v-bind:okto='oktodo' v-on:deltodo='deloktodos(index)' v-on:todook='dotoUp(index)' childisrevamp="ture"></my-li>
</ul>
</div>
</section>
</div></body>
<script>
Vue.component('my-li',{
props:['to','okto','childchecked','childisrevamp'],
template: '<li class="oLi"><input type="checkbox" v-model="childchecked" v-on:change="todook" class="check col-xs-1"/><p class="pull-left col-xs-10"><span v-on:click="childrevamp" v-if="childisrevamp">{{to}}{{okto}}</span><input v-on:blur="childrevamp" v-if="!childisrevamp" class="txt form-control"></input></p><i href="#" v-on:click="deltodo" class="pull-right col-xs-1 glyphicon glyphicon-remove"></i></li>',
methods: {
childAddTodo: function(){
this.$emit('childAddTodo')
},
deltodo: function(){
this.$emit('deltodo');
},
todook: function(){
this.$emit('todook');
},
childrevamp: function(){
this.$emit('childrevamp');
}
}
})
Vue.component('my-h2',{
props: ['num','status'],
template: '<h2 class="h2">{{status}}<span class="pull-right badge" style="margin-top: 8px;">{{num}}</span></h2>'
})
new Vue({
el: '#app',
data: {
todoText: '',
todoList: [],
okTodoText: '',
oktodoList: [],
noNum: 0,
okNum: 0,
checked: true,
isRevamp: true
},
methods: {
addTodo: function(){
this.todoText.trim() ? this.todoList.push((this.todoText).trim()) : alert('你输嘞不对~');
localStorage.notodo = JSON.stringify(this.todoList);
this.noNum = this.todoList.length;
this.todoText = '';
},
deltodos: function(index){
this.todoList.splice(index,1);
localStorage.notodo = JSON.stringify(this.todoList);
this.noNum = this.todoList.length;
},
deloktodos: function(index){
this.oktodoList.splice(index,1);
localStorage.oktodo = JSON.stringify(this.oktodoList);
this.okNum = this.oktodoList.length;
},
dotoDown: function(index){
this.oktodoList.push(this.todoList[index]);
localStorage.oktodo = JSON.stringify(this.oktodoList);
this.deltodos(index);
this.okNum = this.oktodoList.length;
},
dotoUp: function(index){
this.todoList.push(this.oktodoList[index]);
localStorage.notodo = JSON.stringify(this.todoList);
this.deloktodos(index);
localStorage.oktodo = JSON.stringify(this.oktodoList);
this.noNum = this.todoList.length;
},
revamp: function(){
this.isRevamp = !this.isRevamp;
}
},
created:function(){
this.todoList = localStorage.notodo ? JSON.parse(localStorage.notodo) : [];
this.oktodoList = localStorage.oktodo ? JSON.parse(localStorage.oktodo) : [];
this.noNum = this.todoList.length;
this.okNum = this.oktodoList.length;
}
})</script>
</html>`
有什么办法能够在触发revamp事件后只让当前的span隐藏，input显示呢？求大牛指教！
解决方案
this.isRevamp = !this.isRevamp;
这种方式会让所有的todo一起显示或隐藏，
要做到只针对某个todo 的话，你可以为每个todo添加一个isRevamp，然后变成：
todo.isRevamp = !todo.isRevamp;
但这就要求你的数据中一开始每个todo都包涵isRevamp，如果你想动态地添加，会比较麻烦一些，请看文档中有关 响应式原理部分：https://cn.vuejs.org/v2/guide...
但有一个简单的处理方式：data中添加一个index变量，
大致是这样的：
<li v-for="(v,i) in list" v-show="i==index" @click="show(i)">{{v}}</li>
show:function(i){
this.index=i;
}
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