Vue 的 todos 本地存储示例
1：界面效果
2：代码结构：
3：代码内容：
vue.config.js
const { defineConfig } = require('@vue/cli-service')
module.exports = defineConfig({
transpileDependencies: true,
lintOnSave:false /*关闭语法检查*/
})main.js
//引入Vue
import Vue from 'vue'
//引入App
import App from './App.vue'
//关闭Vue生产提示
Vue.config.productionTip=false;
// 创建Vm
const vm = new Vue( {
el:'#app',
render: (h) => h(App)
});
App.vue
<template>
<div id="root">
<div class="todo-container">
<div class="todo-wrap">
<ToListTop :addTodoInfos="addTodoInfos" /><!-- :addTodoInfos="addTodoInfos" 跨组件传递方法并符合数据对象 -->
<ToList :todos="todos"
:onChangeTodosOfDoneInfo="onChangeTodosOfDoneInfo"
:deleteTodosById="deleteTodosById"
/> <!-- :todos="todos" 跨组件进行传值;:onChangeTodosOfDoneInfo="onChangeTodosOfDoneInfo"：组件间数据方法的逐层传递 -->
<ToListFooter :todos="todos" :checkAllTodos="checkAllTodos" :ckearAllTodo="ckearAllTodo" />
</div>
</div>
</div>
</template>
<script>
import ToListTop from './components/ToListTop.vue';
import ToList from './components/ToList.vue';
import ToListFooter from './components/ToListFooter.vue';
export default {
name: 'App',
components: {
ToListTop: ToListTop,
ToList: ToList,
ToListFooter: ToListFooter
},
data() {
return {
todos: JSON.parse(localStorage.getItem('todos')) ||[]
}
},
computed: {},
watch: {
todos:{
deep:true,//深度监控
handler(value){
localStorage.setItem('todos',JSON.stringify(value));
}
}
},
created() { },
mounted() { },
methods: {
// 添加1个todaoObj
addTodoInfos(todoObj){
console.log("App组件，接收到数据",todoObj);
this.todos.unshift(todoObj);
},
// 勾选或者取消勾选1个todoObj
onChangeTodosOfDoneInfo(id){
this.todos.forEach((todo)=>{
if(todo.id==id){
todo.done =!todo.done; //赋值取反操作
}
});
},
//删除一个todo
deleteTodosById(id){
this.todos=this.todos.filter((todo) =>{
return todo.id !==id;
});
},
// 全选 或者 取消全选
checkAllTodos(done){
this.todos.forEach((todo)=>{
todo.done=done;
});
},
// 清除所有已经完成的todo事项
ckearAllTodo(){
this.todos=this.todos.filter((todo)=>{
return !todo.done;
});
}
}
}
</script>
<!--
1：指定Css 样式的编写方式
less 最大特点：内容可以嵌套着写
-->
<style lang="less">
.divCss {
background-color: chocolate;
margin: auto;
padding: 20px;
.h1Css {
font-size: 36px;
color: white;
}
}
/*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>
ToListTop.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="addTodoInfo"/>
</div>
</template>
<script>
import {nanoid} from 'nanoid'
export default {
name: 'ToListTop',
mixins: [],
components: {},
props: ['addTodoInfos'],/* addTodoInfos:接收到父组件的传递过来的方法 ，不同组件的相互调用的方法不能重名*/
data() {
return {
title:""
}
},
computed: {},
watch: {},
created() { },
mounted() { },
methods: {
addTodoInfo(event){
// 校验数据
if(this.title.trim()=="" /* event.target.value */){
return alert("输入内容不能为空");
}
const todo={id:nanoid(),title:this.title/* event.target.value */,done:false};
console.log(todo);
this.addTodoInfos(todo);/* 将子组件的数据通过调用父组件的方式传递给父组件里的todos对象里 */
/* event.target.value=""; */
this.title=""; //清空数据
}
}
}
</script>
<style scoped lang="less">
/*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>
ToList.vue
<template>
<ul class="todo-main">
<ToItem
v-for="todoObj in todos"
:key="todoObj.id"
:todo="todoObj"
:onChangeTodosOfDoneInfo="onChangeTodosOfDoneInfo"
:deleteTodosById="deleteTodosById"
/>
</ul>
</template>
<script>
import ToItem from './ToItem.vue';
export default {
name: 'ToList',
mixins: [],
components: {
ToItem: ToItem
},
props: ['todos', 'onChangeTodosOfDoneInfo','deleteTodosById'],
data() {
return {
}
},
computed: {},
watch: {},
created() { },
mounted() { },
methods: {}
}
</script>
<style scoped lang="less">
/*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>
ToItem.vue
<template>
<li>
<label>
<input type="checkbox" :checked="todo.done" @change="handleCheck(todo.id)" />
<!-- 下面的方案可以 替代 @change="handleCheck(todo.id)" 作功能实现，不推荐。因为违反原则，修改里props里的对象数据，vue没有监测到 -->
<!-- <input type="checkbox" v-model="todo.done" /> --><!-- 一般不建议这么使用 v-model="todo.done" 调用 props传递过来的对象里的数据信息进行数据操作改变-->
<span>{{todo.title}}</span>
</label>
<button class="btn btn-danger" @click="delTodosInfo(todo.id)">删除</button><!-- style="display:none" 控制按钮隐藏 -->
</li>
</template>
<script>
export default {
name: 'ToItem',
// 说明接收todo对象
props:['todo','onChangeTodosOfDoneInfo','deleteTodosById'],
mixins: [],
components: {},
data() {
return {
}
},
computed: {},
watch: {},
created() { },
mounted() { },
methods: {
//勾选 或者 取消勾选
handleCheck(id){
//通知
this.onChangeTodosOfDoneInfo(id);
},
// 删除
delTodosInfo(id){
if(confirm('确定删除吗？')){
console.log(id);
this.deleteTodosById(id);
}
}
}
}
</script>
<style scoped lang="less">
/*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; /*控制按钮隐藏 */
margin-top: 3px;
}
li:before {
content: initial;
}
li:last-child {
border-bottom: none;
}
li:hover{
background-color: #ddd;
}
li:hover button{
display: block;
}
</style>
ToListFooter.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: 'ToListFooter',
mixins: [],
components: {},
props: ['todos','checkAllTodos','ckearAllTodo'],
data() {
return {
}
},
computed: {
// 统计总数
total(){
return this.todos.length;
},
// 统计勾选数量
doneTotal(){
// 计数统计实现方式一：
let total=0;
this.todos.forEach((todo)=>{
if(todo.done){
total++;
}
} );
// return total;
//计数统计实现方式二：
const td= this.todos.reduce((index,todo)=>{
return index+(todo.done?1:0);
},0);
console.log("返回已完成结果值：",td);
// 返回结果值
// return td;
//计数统计实现方式三：
return this.todos.reduce((index,todo)=>index+(todo.done?1:0),0);
},
// 操作全选，取消全选
/* isAll(){ return this.doneTotal === this.total && this.total > 0; } */
isALL:{
get(){
return this.doneTotal === this.total && this.total > 0;
},
set(checked){
return this.checkAllTodos(checked);
}
}
},
watch: {},
created() { },
mounted() { },
methods: {
// 全选，或者 取消全选
checkAll(event){
this.checkAllTodos(event.target.checked);
},
// 清除已完成事项
clearAll(){
this.ckearAllTodo();
}
}
}
</script>
<style scoped lang="less">
/*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>
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