⚡️[前端学习]从0到1做一个Vue风格的Todolist(Vue牛刀小试)⚡️
文章目录前言 App.vue MyHeader.vue MyList.vueMyFooter.vue MyItem.vue运行效果:❤️往期精彩回顾❤️:前言大家好,我是程序员manor,我希望自己能成为国家复兴道路的铺路人,大数据领域的耕耘者,平凡但不甘于平庸的人。学习vue差不多5天了,终于能写代码,以下代码是我按照B站尚硅谷的案例敲出来的:https://www.bilibili.com/v
前言
大家好,我是程序员manor,我希望自己能成为国家复兴道路的铺路人,大数据领域的耕耘者,平凡但不甘于平庸的人。
学习vue差不多5天了,终于能写代码,以下代码是我按照B站尚硅谷的案例敲出来的:
https://www.bilibili.com/video/BV1Zy4y1K7SH?p=82&spm_id_from=pageDriver
整体的目录结构:
忽略掉MyList的报红,暂时弄不清楚如果去除 ,并不影响代码运行
先自己找一个目录,并创建一个vue脚手架:
vue create todo
运行项目
npm run serve
main.js
//引入Vue
import Vue from 'vue'
//引入App
import App from './App.vue'
//关闭Vue的生产提示
Vue.config.productionTip = false
//创建vm
new Vue({
el:'#app',
render: h => h(App)
})
App.vue
创建todolist的主体:
依次是MyHeader、MyList、MyFooter
一些准备:
html及css样式均已上传到网盘
链接:https://pan.baidu.com/s/1ZoIEjkAfBwy_27rkqneR_w
提取码:js8p
导入相关组件
import MyHeader from './components/MyHeader'
import MyList from './components/MyList'
import MyFooter from './components/MyFooter.vue'
components:{MyHeader,MyList,MyFooter}
完整代码:
<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.vue'
export default {
name:'App',
components:{MyHeader,MyList,MyFooter},
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')) || []
}
},
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 => 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
})
}
},
watch: {
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>
MyHeader.vue
接收从App传递过来的addTodo
收集用户输入的title
校验数据
将用户的输入包装成一个todo对象
清空输入
<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"/>
import {nanoid} from 'nanoid'
export default {
name:'MyHeader',
props:['addTodo'],
data() {
return {
title:''
}
},
methods: {
add(){
if(!this.title.trim()) return alert('输入不能为空')
const todoObj = {id:nanoid(),title:this.title,done:false}
this.addTodo(todoObj)
this.title = ''
}
},
}
完整代码:
<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',
//接收从App传递过来的addTodo
props:['addTodo'],
data() {
return {
//收集用户输入的title
title:''
}
},
methods: {
add(){
//校验数据
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}
//通知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>
MyList.vue
声明接收App传递过来的数据,其中todos是自己用的,checkTodo和deleteTodo是给子组件MyItem用的
<MyItem
v-for="todoObj in todos"
:key="todoObj.id"
:todo="todoObj"
:checkTodo="checkTodo"
:deleteTodo="deleteTodo"
/>
import MyItem from "./MyItem";
export default {
name: "MyList",
components: { MyItem },
props: ["todos", "checkTodo", "deleteTodo"],
};
完整代码:
<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 },
//声明接收App传递过来的数据,其中todos是自己用的,checkTodo和deleteTodo是给子组件MyItem用的
props: ["todos", "checkTodo", "deleteTodo"],
};
</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>
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">清除已完成任务</button>
</div>
</template>
<script>
export default {
name:'MyFooter',
props:['todos','checkAllTodo','clearAllTodo'],
computed: {
//总数
total(){
return this.todos.length
},
//已完成数
doneTotal(){
//此处使用reduce方法做条件统计
// const x =this.todos.reduce((pre.current) =>{
// console.log('@',pre)
// return pre + 1
// },0)
//简写
return this.todos.reduce((pre,todo)=> pre + (todo.done ? 1 : 0) ,0)
},
//控制全选框
isAll:{
//全选框是否勾选
get(){
return this.doneTotal === this.total && this.total > 0
},
//isAll被修改时set被调用
set(value){
this.checkAllTodo(value)
}
}
},
methods: {
/* checkAll(e){
this.checkAllTodo(e.target.checked)
} */
//清空所有已完成
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>
MyItem.vue
勾选or取消勾选
通知App组件将对应的todo对象的done值取反
通知App组件将对应的todo对象删除
<template>
<li>
<label>
<!-- <input type="checkbox" :checked="todo.done" @change="handleCheck(todo.id)"/> -->
<!-- 如下代码也能实现功能,但是不太推荐,因为有点违反原则,因为修改了props -->
<!-- <input type="checkbox" v-model="todo.done"/> -->
<input type="checkbox" v-model="todo.done"/>
<span>{{todo.title}}</span>
</label>
<button class="btn btn-danger" @click="handleDelete(todo.id)">删除</button>
</li>
</template>
<script>
export default {
name:'MyItem',
//声明接收todo、checkTodo、deleteTodo
props:['todo','checkTodo','deleteTodo'],
methods: {
handleCheck(id){
this.checkTodo(id)
},
handleDelete(id){
if(confirm('确定删除吗?')){
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 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>
运行效果:
❤️往期精彩回顾❤️:
[前端学习]文件组件专题
总结
到这里恭喜你把Vue入门的第一个案例做完了,如果你还有什么不懂,可随时问我,私信我,如果C站没有回复你,可在公众号后台加我好友,备注:C站来的。希望以上能够帮到刚学习Vue的你!
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