vue学习记录（七）：todoList（任务计划列表）的实现
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学了一段时间的vue了，做一个实战的小项目todoList。
大致功能如下：
1、在输入框中输入内容后按enter键，即可把内容添加到下面的列表中（如果内容为空则不能添加）
2、动态计算有几个未完成的任务
3、点击复选框，实现选中或不选中效果
4、鼠标移入列表，会出现一个删除按钮，点击删除按钮即可删除该列表
5、已经添加的列表任务，即便关闭浏览器或者电脑，下次打开任务还在列表中（用到了本地存储）
具体的项目目录如下：
下面各个文件的具体代码，都有注释哈
main.js
// The Vue build version to load with the `import` command
// (runtime-only or standalone) has been set in webpack.base.conf with an alias.
import Vue from 'vue'
import App from './App'
// import router from './router'
import './base.css'
Vue.config.productionTip = false
/* eslint-disable no-new */
new Vue({
el: '#app',
// router,
components: { App },
template: '<App/>'
})App.vue
<template>
<div class="todo-container">
<div class="todo-wrap">
<TodoHeader :addTodo="addTodo" />
<TodoList :todos="todos" :deleteTodo="deleteTodo" />
<TodoFooter :todos="todos" :deleteCompeteTodos="deleteCompeteTodos" :selectAllTodos="selectAllTodos" />
</div>
</div>
</template>
<script>
import TodoHeader from './components/TodoHeader'
import TodoList from './components/TodoList'
import TodoFooter from './components/TodoFooter'
export default {
data() {
//localStorage将列表存入一个中间数组list,在每次开始前赋值给任务列表数组todos
var list=JSON.parse(localStorage.getItem('key'));
console.log(list,list.length);
return {
todos: list
}
},
methods: {
addTodo(todo) { //接收todo
// this.todos.unshift(todo) //添加到第一个todo上面，title[0]
this.todos.push(todo);
//同时更新数据到localStorage
localStorage.setItem('key',JSON.stringify(this.todos));
},
//删除
deleteTodo(index) {
this.todos.splice(index, 1)
//同时更新数据到localStorage
localStorage.setItem('key',JSON.stringify(this.todos));
},
//删除所有选中的todo
deleteCompeteTodos() {
//过滤出false的留下 todo.complete取反
this.todos = this.todos.filter(todo => !todo.complete)
//同时更新数据到localStorage
localStorage.setItem('key',JSON.stringify(this.todos));
},
//全选/全不选
selectAllTodos(check) { //状态变化所以传参数
//遍历todos改变check状态
this.todos.forEach(todo => todo.complete = check)
//同时更新数据到localStorage
localStorage.setItem('key',JSON.stringify(this.todos));
}
},
components: {
TodoHeader,
TodoList,
TodoFooter
}
}
</script>
<style scoped>
.todo-container {
width: 600px;
margin: 0 auto;
}
.todo-container .todo-wrap {
padding: 10px;
border: 1px solid #ddd;
border-radius: 5px;
}
</style>base.css
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, 2155, 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;
}TodoHeader.vue
<template>
<div class="todo-todo">
<h2>任务计划列表</h2>
<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="addItem"
/>
</div>
</div>
</template>
<script>
export default {
props: {
addTodo: Function
},
data() {
return {
title: ""
};
},
methods: {
addItem() {
//1.检查输入的合法性
const title = this.title.trim();
if (!title) {
alert("必须输入");
return;
}
//2.根据输入生成一个todo对象
const todo = {
title,
complete: false
};
//3.添加到todos
this.addTodo(todo);
//4.清除输入
this.title = "";
}
}
};
</script>
<style scoped>
h2 {
margin: 0;
font-size: 18px;
color: rgb(255, 255, 255);
}
.todo-todo {
width: 100%;
height: 37px;
border: 10px;
border-radius: 4px;
background-color: rgb(197, 70, 70);
}
.todo-header input {
width: 560px;
height: 28px;
margin-top: 25px;
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>TodoFooter.vue
<template>
<div class="todo-footer">
<label>
<input type="checkbox" v-model="isAllCheck" />
</label>
<span>
<span>已完成{{ completeSize }}</span> / 全部{{ todos.length }}
</span>
<button class="btn btn-danger" v-show="completeSize" @click="deleteCompeteTodos">清除已完成任务</button>
</div>
</template>
<script>
export default {
props: {
todos: Array,
deleteCompeteTodos: Function,
selectAllTodos: Function
},
computed: {
completeSize() { //统计已完成
return this.todos.reduce((preTotal, todo) => preTotal + (todo.complete ? 1 : 0), 0)
},
isAllCheck: {
get() { //确定当前是true还是false
return this.completeSize === this.todos.length && this.completeSize > 0
},
set(value) { //value是当前checkbox最新的值，set监视变化
this.selectAllTodos(value)
}
}
}
}
</script>
<style scoped>
.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>TodoItem.vue
<template>
<li @mouseenter="handleEnter(true)" @mouseleave="handleEnter(false)" :style="{background: bgColor}">
<label>
<input type="checkbox" v-model="todo.complete" />
<span>{{ todo.title }}</span>
</label>
<button class="btn btn-danger" v-show="isShow" @click="deleteItem">删除</button>
</li>
</template>
<script>
export default {
props: {
todo: Object,
index: Number,
deleteTodo: Function
},
data() {
return {
bgColor: 'white', //默认的背景颜色
isShow: false //按钮默认是否显示
}
},
methods: {
handleEnter(isEnter) {
if (isEnter) {
this.bgColor = '#aaaaaa'
this.isShow = true
} else {
this.bgColor = 'white'
this.isShow = false
}
},
deleteItem() {
const {
todo,
index,
deleteTodo
} = this
if (window.confirm(`确认删除${todo.title}吗？`)) {
deleteTodo(index) //调用函数更新
}
}
}
}
</script>
<style scoped>
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;
margin-top: 3px;
}
li:before {
content: initial;
}
li:last-child {
border-bottom: none;
}
</style>TodoList.vue
<template>
<ul class="todo-main">
<TodoItem v-for="(todo,index) in todos" :key="index" :todo="todo" :index="index" :deleteTodo="deleteTodo" />
</ul>
</template>
<script>
import TodoItem from './TodoItem'
export default {
props: {
todos: Array,
deleteTodo: Function
},
components: {
TodoItem,
}
}
</script>
<style scoped>
.todo-main {
margin-top: 55px;
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>运行截图：
因为采用了本地存储技术，并且为了更好地掌握JavaScript中的localStorage功能的具体操作方法的缘故，特意参考了这篇博客以获取更多信息。
完整代码：GitHub
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