完整项目：
App.vue
<template>
<div id="root">
<div class="todo-container">
<div class="todo-wrap">
<MyHeader :addTodo="addTodo"/>
<MyList :todos="todos" :checkTodo="checkTodo" :deleteTodo="deleteTodo"/>
<MyFooter :todos="todos" :checkAllTodo="checkAllTodo" :clearAllTodo="clearAllTodo"/>
</div>
</div>
</div>
</template>
<script>
import MyHeader from './components/MyHeader'
import MyList from './components/MyList'
import MyFooter from './components/MyFooter'
export default {
name:'App',
components:{MyHeader,MyList,MyFooter},
data(){
return{
todos:[
{id:'001',title:'唱',done:true},
{id:'002',title:'跳',done:false},
{id:'003',title:'rap',done:true},
{id:'004',title:'篮球',done:true}
]
}
},
methods:{
//添加一个todo
addTodo(todoObj){
this.todos.unshift(todoObj)
},
//勾选or取消勾选一个todo
checkTodo(id){
this.todos.forEach((todo)=>{
if (todo.id===id)todo.done=!todo.done
})
},
//删除一个todo
deleteTodo(id){
this.todos = this.todos.filter((todo)=>{
return todo.id !==id
})
},
//全选or取消全选
checkAllTodo(done){
this.todos.forEach((todo)=>{
todo.done = done
})
},
//清除所有已经完成的todo
clearAllTodo(){
this.todos = this.todos.filter((todo)=>{
return !todo.done
})
}
}
}
</script>
<style>
/*base*/
body {
background: #fff;
}
.btn {
display: inline-block;
padding: 4px 12px;
margin-bottom: 0;
font-size: 14px;
line-height: 20px;
text-align: center;
vertical-align: middle;
cursor: pointer;
box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.05);
border-radius: 4px;
}
.btn-danger {
color: #fff;
background-color: #da4f49;
border: 1px solid #bd362f;
}
.btn-danger:hover {
color: #fff;
background-color: #bd362f;
}
.btn:focus {
outline: none;
}
.todo-container {
width: 600px;
margin: 0 auto;
}
.todo-container .todo-wrap {
padding: 10px;
border: 1px solid #ddd;
border-radius: 5px;
}
</style>
MyList.vue
<template>
<ul class="todo-main">
<MyItem v-for="todoObj in todos"
:key="todoObj.id"
:todo="todoObj"
:checkTodo="checkTodo"
:deleteTodo="deleteTodo"
/>
</ul>
</template>
<script>
import MyItem from "./MyItem";
export default {
name: "MyList",
components:{
MyItem
},
props:['todos','checkTodo','deleteTodo']
}
</script>
<style scoped>
.todo-main{
margin-left: 0px;
border: 1px solid #ddd;
border-radius: 2px;
padding: 0px;
}
.todo-empty{
height: 40px;
line-height: 40px;
border: 1px solid #ddd;
border-radius: 2px;
padding-left:5px;
margin-top: 10px;
}
</style>
MyItem.vue
<template>
<div>
<li>
<label >
<input type="checkbox" :checked="todo.done" @change="handleCheck(todo.id)"/> <!--给input指定一个checked选项，如果是true就勾选上，如果是false就不勾选-->
<span>{{todo.title}}</span>
</label>
<button class="btn btn-danger" @click="handleDelete(todo.id)">删除</button>
</li>
</div>
</template>
<script>
export default {
name: "MyItem",
//声明接收对象
props:[
'todo',
'checkTodo',
'deleteTodo'
],
methods:{
//勾选or取消勾选
handleCheck(id){
//通知App组件将对应的todo对象的done值取反
this.checkTodo(id)
},
//删除
handleDelete(id){
if (confirm('确定删除吗')){ //confirm根据用户的交互来决定到底是布尔值为真还是为假，点击确定为真，点击取消为假
this.deleteTodo(id)
}
}
}
}
</script>
<style scoped>
li{
list-style: none;
height: 36px;
line-height: 36px;
padding: 0 5px;
border-bottom: 1px solid #ddd;
}
li label{
float:left;
cursor: pointer;
}
li label li input{
vertical-align: middle;
margin-right: 6px;
position: relative;
top: -1px;
}
li button{
float: right;
display: none;
margin-top: 3px;
}
li:before{
content: initial;
}
li:last-child{
border-bottom: none;
}
li:hover{
background-color: #ddd;
}
li:hover button{
display: block;
}
</style>
MyHeader.vue
<template>
<div class="todo-header">
<input type="text" placeholder="请输入你的任务名称，按回车键确认" v-model="title" @keyup.enter="add"><!--绑定一个键盘事件，按下回车再走逻辑.enter-->
</div>
</template>
<script>
import {nanoid} from 'nanoid'
export default {
name: "MyHeader",
props:['addTodo'],
data(){
return{
title:''
}
},
methods:{
add(){
if (!this.title.trim()) return //trim()清楚空格
//将用户的输入，包装成一个todo对象
const todoObj = {id:nanoid(),title:this.title,done:false}
//同志App组件去添加一个todo对象
this.addTodo(todoObj)
//清空输入
this.title=''
}
}
}
</script>
<style scoped>
/* header */
.todo-header input{
width:560px;
height: 28px;
font-size: 14px;
border: 1px solid #ccc;
border-radius: 4px;
padding: 4px 7px;
}
.todo-header input:focus{
outline: none;
border-color: rgba(82, 168, 236, 0.8);
box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075),0 0 8px rgba(82, 168, 236, 0.6);
}
</style>
MyFooter.vue
<template>
<div class="todo-footer" v-show="total">
<label>
<!-- <input type="checkbox" :checked="isAll" @change="checkAll"/>-->
<input type="checkbox" v-model="isAll"/>
</label>
<span>
<span>已完成{{doneTotal}}</span> / 全部{{total}}
</span>
<button class="btn btn-danger" @click="clearAll">清除已完成的任务</button>
</div>
</template>
<script>
export default {
name: "MyFooter",
props:[
'todos',
'checkAllTodo',
'clearAllTodo'
],
computed:{
total(){
return this.todos.length
},
doneTotal(){
/* const x = this.todos.reduce((pre,current)=>{
console.log('@',pre,current)
return pre+(current.done?1:0)
},0)*/
return this.todos.reduce((pre,todo)=>pre+(todo.done?1:0),0)
},
isAll:{
get(){
return this.doneTotal === this.total && this.total>0
},
set(checked){
this.checkAllTodo(checked)
}
}
},
methods:{
clearAll(){
this.clearAllTodo()
}
}
}
</script>
<style scoped>
/* Footer */
.todo-footer {
height: 40px;
line-height: 40px;
padding-left: 6px;
margin-top: 5px;
}
.todo-footer label{
display: inline-block;
margin-right: 20px;
cursor: pointer;
}
.todo-footer label input{
position: relative;
top: 1px;
vertical-align: middle;
margin-right: 5px;
}
.todo-footer button{
float: right;
margin-top: 5px;
}
</style>
main.js
//引入Vue
import Vue from 'vue'
//引入App
import App from "./App";
//关闭Vue的生产提示
Vue.config.productionTip = false
//创建vm
new Vue({
el:'#app',
render:h=>h(App)
})index.html
<!DOCTYPE html>
<html lang="">
<head>
<meta charset="utf-8">
<!-- 针对IE浏览器的一个特殊配置，含义是让IE浏览器以最高的渲染级别渲染页面-->
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<!-- 开启移动端的理想视口-->
<meta name="viewport" content="width=device-width,initial-scale=1.0">
<!-- 配置页签图标，<%= BASE_URL %>指的是从public路径开始往后-->
<link rel="icon" href="<%= BASE_URL %>favicon.ico">
<!-- 配置网页标题-->
<title><%= htmlWebpackPlugin.options.title %></title>
</head>
<body>
<!-- 当浏览器不支持js时noscript中的元素就会被渲染-->
<noscript>
<strong>We're sorry but <%= htmlWebpackPlugin.options.title %> doesn't work properly without JavaScript enabled. Please enable it to continue.</strong>
</noscript>
<!-- 容器-->
<div id="app"></div>
<!-- built files will be auto injected -->
</body>
</html>
总结：
