TodoList案例笔记 | 尚硅谷Vue2.0
尚硅谷Vue2.0+Vue3.0全套教程丨vuejs从入门到精通 -- TodoList案例
个人笔记，可运行.
Public
index.html
<!DOCTYPE html>
<html lang="">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width,initial-scale=1.0">
<link rel="icon" href="<%= BASE_URL %>favicon.ico">
<title><%= htmlWebpackPlugin.options.title %></title>
</head>
<body>
<noscript>
<strong>We're sorry but <%= htmlWebpackPlugin.options.title %> doesn't work properly without JavaScript enabled. Please enable it to continue.</strong>
</noscript>
<div id="app"></div>
<!-- built files will be auto injected -->
</body>
</html>
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.trim="title" @keydown.enter="add"/>
</div>
</template>
<script>
import nanoid from "nanoid"
export default {
name: "MyHeader",
props:["receive"],
data(){
return {
title:''
}
},
methods:{
add(){
if(!this.title) return alert("输入不能为空")
let obj = {id:(new Date()).getTime().toString(),title:this.title,done:false};
this.receive(obj);
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
<template>
<ul class="todo-main">
<MyItem v-for="todo in todos" :key="todo.id" :todo="todo" :handleChange="handleChange" :handleDelete="handleDelete"/>
</ul>
</template>
<script>
import MyItem from "./MyItem.vue";
export default {
name: "MyList",
components: {
MyItem,
},
props:['todos','handleChange',"handleDelete"],
};
</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>
MyItem.vue
<template>
<li>
<label>
<input type="checkbox" :checked="todo.done" @change="handleChange(todo.id)"/>
<span>{{todo.title}}</span>
</label>
<button class="btn btn-danger" @click="handleDelete(todo.id)">删除</button>
</li>
</template>
<script>
export default {
name:"MyItem",
props:["todo","handleChange","handleDelete"],
}
</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>
MyFooter.vue
<template>
<div class="todo-footer" v-show="total">
<label>
<input type="checkbox" v-model="isAll"/>
</label>
<span> <span>已完成{{undone}}</span> / {{total}} </span>
<button class="btn btn-danger" @click="clearAllTodo">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
},
undone(){
// 1,过滤
// let n=0;
// this.todos.forEach(el => {
// if(el.done)n++
// });
// return n
// 2.统计
// const x = this.todos.reduce((premtodo)=>{
// return pre + (todo.done ? 1: 0)
// },0)
// console.log(x);
// 3.统计-简写
return this.todos.reduce((pre,todo)=> pre + (todo.done ? 1: 0),0)
},
isAll:{
get(){
return this.undone==this.total
},
set(v){
this.checkAllTodo(v);
}
}
}
};
</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>
App.vue
<template>
<div class="todo-container">
<div class="todo-wrap">
<MyHeader :receive="receive" />
<MyList :todos="todos" :handleChange="handleChange" :handleDelete="handleDelete"/>
<MyFooter :todos="todos" :checkAllTodo="checkAllTodo" :clearAllTodo="clearAllTodo"/>
</div>
</div>
</template>
<script>
import MyHeader from "./components/MyHeader.vue";
import MyFooter from "./components/MyFooter.vue";
import MyList from "./components/MyList.vue";
export default {
name: "App",
components: {
MyHeader,
MyFooter,
MyList,
},
data() {
return {
todos: JSON.parse(localStorage.getItem("todos")) ? JSON.parse(localStorage.getItem("todos")) : []
}
},
watch:{
todos:{
deep:true,
handler(v){
localStorage.setItem("todos",JSON.stringify(v))
}
}
},
methods:{
// 添加一个todo
receive(obj){
this.todos.unshift(obj);
},
// 勾选or取消勾选一个todo
handleChange(id){
this.todos.forEach((el)=>{
if(el.id==id)el.done=!el.done;
})
},
// 删除一个todo
handleDelete(id){
this.todos = this.todos.filter(el=>el.id!==id)
},
// 全选or取消全选
checkAllTodo(v){
this.todos.forEach((el)=>{
el.done=v
})
},
// 清除所有已经完成的todo
clearAllTodo(){
this.todos=this.todos.filter((el)=>{
return !el.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>
main.js
import Vue from 'vue'
import App from './App.vue'
Vue.config.productionTip = false
new Vue({
render: h => h(App),
}).$mount('#app')
