(160条消息) Todo-List案例版本二_bubbleJessica的博客-CSDN博客
引入了自定义事件,让案例更加完善
src/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',
data() {
return {
// 由于todos是MyHeader组件和MyFooter组件都在使用,所以放在App中(状态提升)
todos: JSON.parse(localStorage.getItem('todos')) || []
}
},
components: { MyHeader, MyList, MyFooter },
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) {
// 注意:filter不改变原数组,只是新建一个数组
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
})
},
// 清除所有已完成的todo
clearAllTodo() {
this.todos = this.todos.filter((todo) => {
return !todo.done
})
}
},
watch: {
// todos简写不包含深度监视
// todos(value) {
// localStorage.setItem('todos', JSON.stringify(value))
// }
// todos完整版深度监视
todos:{
deep:true,
handler(value){
localStorage.setItem('todos', JSON.stringify(value))
}
}
}
}
</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>
src/components/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()" />
</div>
</template>
<script>
import {nanoid} from 'nanoid'
export default {
name: 'MyHeader',
data(){
return{
title:''
}
},
// props:['addToDo'],
methods:{
add(){
if(!this.title.trim()) return alert('输入不能为空!')
// 给用户输入的内容包装成一个todoObj对象
const todoObj={id:nanoid(),title:this.title,done:false};
// this.addToDo(todoObj);
this.$emit('addToDo',todoObj)
this.title='';
}
}
}
</script>
<style scoped>
/*header*/
.todo-header input {
width: 560px;
height: 28px;
font-size: 14px;
border: 1px solid #ccc;
border-radius: 4px;
padding: 4px 7px;
}
.todo-header input:focus {
outline: none;
border-color: rgba(82, 168, 236, 0.8);
box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(82, 168, 236, 0.6);
}
</style>
src/components/MyFooter.vue文章来源:https://www.toymoban.com/news/detail-540145.html
<template>
<div class="todo-footer" v-show="total">
<label>
<!-- <input type="checkbox" :checked="isAll" @change="checkAll"/> -->
<input type="checkbox" v-model="isAll"/>
</label>
<span>
<span>已完成{{ doneTotal }}</span> / 全部{{ total }}
</span>
<button class="btn btn-danger" @click="clearAll">清除已完成任务</button>
</div>
</template>
<script>
export default {
name: 'MyFooter',
// props: ['todos','checkAllTodo','clearAllTodo'],
props: ['todos'],
computed: {
total() {
return this.todos.length
},
doneTotal() {
// 数组.reduce()方法
// const x = this.todos.reduce((pre, cur) => {
// return pre + (cur.done ? 1 : 0)
// }, 0)
// return x
return this.todos.reduce((pre, todo) => pre + (todo.done ? 1 : 0), 0)
},
// 计算属性简写版
// isAll() {
// return this.doneTotal === this.total && this.total > 0
// }
// 计算属性完整版
isAll:{
get(){
return this.doneTotal === this.total && this.total > 0
},
set(value){
// this.checkAllTodo(value);
this.$emit('checkAllTodo',value)
}
}
},
// methods:{
// checkAll(e){
// // console.log(e.target.checked);
// this.checkAllTodo(e.target.checked);
// }
// }
methods:{
clearAll(){
// this.clearAllTodo()
this.$emit('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>
总结:@addToDo="addToDo" 红色是事件名,紫色是回调名文章来源地址https://www.toymoban.com/news/detail-540145.html
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