1.
安装
npm i nanoid
mdn 数组的方法
typora 安装
2. App.vue
<template>
<div id="root">
<div class="todo-container">
<div class="todo-wrap">
<!--传递函数 儿子给父亲传东西,父亲偷偷传递一个函数，儿子调用这个函数-->
<MyHeader :addTodo="addTodo"/>
<!--父亲给儿子传数据 父亲通过数据绑定传数据 儿子通过 props:['todos'],//声明接收todo 对象 -->
<MyList :todos="todos" :checkTodo="checkTodo" :deleteTodo="deleteTodo"/>
<MyFooter :todos="todos" :checkAllTodo="checkAllTodo" :clearAllTodo="clearAllTodo"/>
</div>
</div>
</div>
</template>
<script>
//样式的引入和这里有关系
import MyHeader from './components/MyHeader.vue';
import MyList from './components/MyList.vue';
import MyFooter from './components/MyFooter.vue';
export default {
name: 'App',
components: {
MyHeader,
MyList,
MyFooter
},
data(){
return {
todos:[
{id:'001',title:"吃饭",done:true},
{id:'002',title:"睡觉",done:true},
{id:'003',title:"学习",done:false},
]
}
},
methods:{
// 添加一个todo
addTodo(todoObj){
// console.log('我是app组件,我收到了数据x==',todoObj);
this.todos.unshift(todoObj)
},
//勾选or 取消勾选 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全不选
checkAllTodo(done){
this.todos.forEach((todo)=>{
todo.done=done
})
},
clearAllTodo(){
this.todos=this.todos.filter((todo)=>{
return !todo.done
})
}
}
}
</script>
<style>
/* 整体样式 */
body {
background: rgba(230, 241, 245, 0.816);
}
.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>
3.MyHeader.vue
<template>
<div class="todo-header">
<!--v-model:="title" 是实时绑定的 -->
<input type="text" placeholder="请输入你的任务名称，回车键确认" v-model="title" @keyup.enter="add"/>
</div>
</template>
<script>
import {nanoid} from 'nanoid'
export default {
name:"MyHeader",
props:['addTodo'],
data(){
return {
title:""
}
},
methods:{
add(){
//console.log(e.target.value);
//const todoObj={id:nanoid(),title:e.target.value,done:false}
if(!this.title.trim()) return alert("输入不能为空");
//将用户的输入包装成一个todo 对象
const todoObj={id:nanoid(),title:this.title,done:false}
//console.log(todoObj);
// 通知app 组件去添加一个todo 对象
this.addTodo(todoObj);
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>
4. 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.vue';
export default{
name:"MyList",
components:{MyItem},
props:['todos','checkTodo','deleteTodo'],//声明接收todo 对象
}
</script>
<style scoped>
/*main*/
.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>
5. MyItem.vue
<template>
<li>
<label>
<input type="checkbox" :checked="todo.done" @click="handlerCheck(todo.id)"/>
<!--
let a=1;
a=2;
改了
let obj={a:1,b:2}
obj.a=8; 代码层底改了 但是 obj 内存地址没有变化 vue 认为没有变化
如下代码也能实现功能 但是步太推荐 因为有点违反了原则 因为修改了 props 属性
-->
<!-- <input type="checkbox" v-model:="todo.done"/> -->
<span>{{todo.title}}</span>
</label>
<button class="btn btn-danger" @click="hadnlerDelete(todo.id)">删除</button>
</li>
</template>
<script>
export default {
name:"MyItem",
props:['todo','checkTodo','deleteTodo'],//声明接收todo 对象
mounted(){
//console.log(this.todo);
},
methods:{
//勾选或者取消勾选
handlerCheck(id){
//通知app 组件 将对应的todo 对象的done 值取反
//console.log("id",id);
this.checkTodo(id);
},
//闪促
hadnlerDelete(id){
if(confirm('确定删除么')){
//console.log("id",id);
//通知app 删除一个对象
this.deleteTodo(id);
}
}
}
}
</script>
<style scoped>
/*item*/
li {
list-style: none;
height: 36px;
line-height: 36px;
padding: 0 5px;
border-bottom: 1px solid #ddd;
}
li label {
float: left;
cursor: pointer;
}
li:hover {
background-color: grey;
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:hover button {
display: block;
}
li:before {
content: initial;
}
li:last-child {
border-bottom: none;
}
</style>
6. MyFooter.vue
<template>
<div class="todo-footer" v-show="total">
<label>
<!-- <input type="checkbox" :checked="isAll" @change="checkAll"/> -->
<!--换种写法输入类型的节点 初始值要展示 并且后面要交互-->
<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">清除已完成任务</button>
</div>
</template>
<script>
export default {
name:"MyFooter",
props:['todos','checkAllTodo','clearAllTodo'],
computed:{
total(){
return this.todos.length
},
doneTotal(){
// const donetotal=this.todos.reduce((pre,current)=>{
// //console.log('@@@@@@@');
// return pre+(current.done?1:0)
// },0)
// return donetotal;
//简写
return this.todos.reduce((pre,current)=>pre+(current.done?1:0),0);
},
// 这个是简写的形式 只被读取 不能被修改
// isAll(){
// return this.doneTotal===this.total&&this.total>0
// }
isAll:{
get(){
return this.doneTotal===this.total&&this.total>0
},
set(checked){
this.checkAllTodo(checked)
}
}
},
methods:{
checkAll(e){
this.checkAllTodo(e.target.checked)
},
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>