vue3 todolist 简单例子

vue3 简单的TodList
地址： https://gitee.com/cheng_yong_xu/vue3-composition-api-todo-app-my

效果
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step-1

初始化项项目
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我们不采用vue cli 搭建项目

直接将上图文件夹，复制到vscode编辑器，清空App.vue的内容

安装包

# 安装包
npm i
# 启动
npm run serve

在这里插入图片描述

step-2

先写样式结构
在这里插入图片描述


<template>
	<h1>ToDo Apph1>
	<form>
		<label for="">添加待办项label>
		<input type="text" name="newTodo" autocomplete="off" />
		<button>添 加button>
	form>

	<h2>待办列表h2>
	<ul>
		<li>
			<span>代办列表span>
			<button>删 除button>
		li>
	ul>
template>

<script>
export default {}
script>

<style lang="scss">
$size1: 6px;
$size2: 12px;
$size3: 18px;
$size4: 24px;
$size5: 48px;
$backgroundColor: #27292d;
$primaryColor: #EC23F3;
$secondTextColor: #1f2023;

$border: 2px solid rgba($color: white,
		$alpha: 0.35,
	);

$textColor: white;
$border_r: 2px solid red;
$border_y: 2px solid rgb(241, 229, 50);
$border_g: 2px solid rgb(50, 241, 50);
$border_w: 2px solid white;

body {
	margin: 0;
	padding: 0;
	font-family: Avenir, Helvetica, Arial, sans-serif;
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
	background-color: $backgroundColor;
	color: $textColor;

	#app {
		max-width: 600px;
		margin-left: auto;
		margin-right: auto;
		padding: 20px;
		// border: $border_w;

		h1 {
			font-weight: bold;
			font-size: 28px;
			text-align: center;
			// border: $border_r;
		}

		form {
			display: flex;
			flex-direction: column;
			width: 100%;

			label {
				font-size: 14px;
				font-weight: bold;
			}

			input,
			button {
				height: $size5;
				box-shadow: none;
				outline: none;
				padding-left: $size2;
				padding-right: $size2;
				border-radius: $size1;
				font-size: 18px;
				margin-top: $size1;
				margin-bottom: $size2;
				transition: all 0.2s ease-in-out;
				/* 添加过渡效果，使变化平滑 */
			}

			input {
				background-color: transparent;
				border: $border;
				color: inherit;
			}

			input:hover {
				border: 2px solid rgb(236, 35, 243);
			}

			button {
				cursor: pointer;
				background-color: rgb(236, 35, 243);
				border: 1px solid $primaryColor;
				font-weight: bold;
				color: white;
				border-radius: $size1;
			}
		}

		h2 {
			// border: $border_g;
			font-size: 22px;
			border-bottom: $border;
			padding-bottom: $size1;

		}

		ul {
			padding: 10px;

			li {
				display: flex;
				justify-content: space-between;
				align-items: center;
				border: $border;
				padding: 10px;
				border-radius: $size1;
				margin-bottom: $size2;

				span {
					cursor: pointer;
				}

				button {
					cursor: pointer;
					font-size: $size2;
					background-color: rgb(236, 35, 243);
					border: 1px solid $primaryColor;
					font-weight: bold;
					color: white;
					padding: 5px 15px;
					border-radius: $size1;
				}
			}
		}
	}
}
style>

step-3

双向绑定数据

<!-- src\App.vue -->
<template>
	<h1>ToDo App</h1>
	<form @submit.prevent="addTodo()">
		<label for="">添加待办项</label>
		<input type="text" name="newTodo" autocomplete="off" v-model="newTodo"/>
		<button>添 加</button>
	</form>

	<h2>待办列表</h2>
	<ul>
		<li>
			<span>代办列表</span>
			<button>删 除</button>
		</li>
	</ul>
</template>

<script>
import {ref } from 'vue';
export default {
	name: 'App',
	setup(){
		const newTodo = ref('');

		function addTodo(){
			if(newTodo.value){
				console.log(newTodo.value);
			}
		}

		return {
			newTodo,
			addTodo
		}
	}
}
</script>

在这里插入图片描述

step-4

定义数据并将数据变成响应式的
将数据持久化到本地

定义数据并将数据变成响应式的


<script>
import { ref } from 'vue';
export default {
	name: 'App',
	setup() {
		const newTodo = ref('');
		const defaultData = ref([
			{
				done: false,
				content: '今天要学习Vue'
			}
		]);

		const todos = ref(defaultData);

		function addTodo() {
			if (newTodo.value) {
				todos.value.push({
					done: false,
					content: newTodo.value
				})
			}
			console.log(todos.value)
		}

		return {
			newTodo,
			addTodo
		}
	}
}
</script>

在这里插入图片描述

将数据持久化到本地

<script>
import { ref } from 'vue';
export default {
	name: 'App',
	setup() {
		const newTodo = ref('');
		const defaultData = ref([
			{
				done: false,
				content: '今天要学习Vue'
			}
		]);

		const todos = ref(defaultData);

		function addTodo() {
			if (newTodo.value) {
				todos.value.push({
					done: false,
					content: newTodo.value
				})
			}
			saveData()
			console.log(sessionStorage.getItem('todos'))
		}

		function saveData () {
			const storageData = JSON.stringify(todos.value)
			sessionStorage.setItem('todos', storageData)
		}

		return {
			newTodo,
			addTodo
		}
	}
}
</script>

在这里插入图片描述

step-5

渲染待办列表

	<h2>待办列表</h2>
	<ul>
		<li v-for="(todo, index) in todos" :key="index">
			<span>{{ todo.content }}</span>
			<button>删 除</button>
		</li>
	</ul>

在这里插入图片描述
点击文字划横线
点击删除从待办列表移除

<!-- src\App.vue -->
<template>
	<h1>ToDo App</h1>
	<form @submit.prevent="addTodo()">
		<label for="">添加待办项</label>
		<input type="text" name="newTodo" autocomplete="off" v-model="newTodo" />
		<button>添 加</button>
	</form>

	<h2>待办列表</h2>
	<ul>
		<li v-for="(todo, index) in todos" :key="index">
			<span
			:class="{ done: todo.done }"
			@click="todo.done = !todo.done"
			>{{ todo.content }}</span>
			<button @click="removeTodo(index)">删 除</button>
		</li>
	</ul>
</template>

<script>
import { ref } from 'vue';
export default {
	name: 'App',
	setup() {
		const newTodo = ref('');
		const defaultData = ref([
			{
				done: false,
				content: '今天要学习Vue'
			}
		]);

		const todos = ref(defaultData);

		function addTodo() {
			if (newTodo.value) {
				todos.value.push({
					done: false,
					content: newTodo.value
				})
				newTodo.value = ''
			}
			saveData()
			console.log(sessionStorage.getItem('todos'))
		}

		function removeTodo(index) {
			todos.value.splice(index, 1)
			saveData()
		}
		function saveData() {
			const storageData = JSON.stringify(todos.value)
			sessionStorage.setItem('todos', storageData)
		}

		return {
			newTodo,
			todos,
			addTodo,
			removeTodo
		}
	}
}
</script>
<style lang="scss">
$size1: 6px;
$size2: 12px;
$size3: 18px;
$size4: 24px;
$size5: 48px;
$backgroundColor: #27292d;
$primaryColor: #EC23F3;
$secondTextColor: #1f2023;

$border: 2px solid rgba($color: white,
		$alpha: 0.35,
	);

$textColor: white;
$border_r: 2px solid red;
$border_y: 2px solid rgb(241, 229, 50);
$border_g: 2px solid rgb(50, 241, 50);
$border_w: 2px solid white;

body {
	margin: 0;
	padding: 0;
	font-family: Avenir, Helvetica, Arial, sans-serif;
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
	background-color: $backgroundColor;
	color: $textColor;

	#app {
		max-width: 600px;
		margin-left: auto;
		margin-right: auto;
		padding: 20px;
		// border: $border_w;

		h1 {
			font-weight: bold;
			font-size: 28px;
			text-align: center;
			// border: $border_r;
		}

		form {
			display: flex;
			flex-direction: column;
			width: 100%;

			label {
				font-size: 14px;
				font-weight: bold;
			}

			input,
			button {
				height: $size5;
				box-shadow: none;
				outline: none;
				padding-left: $size2;
				padding-right: $size2;
				border-radius: $size1;
				font-size: 18px;
				margin-top: $size1;
				margin-bottom: $size2;
				transition: all 0.2s ease-in-out;
				/* 添加过渡效果，使变化平滑 */
			}

			input {
				background-color: transparent;
				border: $border;
				color: inherit;
			}

			input:hover {
				border: 2px solid rgb(236, 35, 243);
			}

			button {
				cursor: pointer;
				background-color: rgb(236, 35, 243);
				border: 1px solid $primaryColor;
				font-weight: bold;
				color: white;
				border-radius: $size1;
			}
		}

		h2 {
			// border: $border_g;
			font-size: 22px;
			border-bottom: $border;
			padding-bottom: $size1;

		}

		ul {
			padding: 10px;

			li {
				display: flex;
				justify-content: space-between;
				align-items: center;
				border: $border;
				padding: 10px;
				border-radius: $size1;
				margin-bottom: $size2;

				span {
					cursor: pointer;
				}
				.done {
					text-decoration: line-through;
				}

				button {
					cursor: pointer;
					font-size: $size2;
					background-color: rgb(236, 35, 243);
					border: 1px solid $primaryColor;
					font-weight: bold;
					color: white;
					padding: 5px 15px;
					border-radius: $size1;
				}
			}
		}
		h4 {
			text-align: center;
			opacity: 0.5;
			margin: 0;
		}
	}
}
</style>

在这里插入图片描述

step-6

目前我们的数据虽然存在本地，但是我们使用的是内存中的数据，应该使用本地的数据
关闭浏览器再打开看到的还是和关闭之前一样的数据

<template>
	<h1>ToDo App</h1>
	<form @submit.prevent="addTodo()">
		<label>New ToDo </label>
		<input
			v-model="newTodo"
			name="newTodo"
			autocomplete="off"
		>
		<button>Add ToDo</button>
	</form>
	<h2>ToDo List</h2>
	<ul>
		<li
			v-for="(todo, index) in todos"
			:key="index"
		>
			<span
				:class="{ done: todo.done }"
				@click="doneTodo(todo)"
			>{{ todo.content }}</span>
			<button @click="removeTodo(index)">Remove</button>
		</li>
	</ul>
	<h4 v-if="todos.length === 0">Empty list.</h4>
</template>

<script>
	import { ref } from 'vue';
	export default {
		name: 'App',
		setup () {
			const newTodo = ref('');
			const defaultData = [{
				done: false,
				content: 'Write a blog post'
			}]
			const todosData = JSON.parse(localStorage.getItem('todos')) || defaultData;
			const todos = ref(todosData);
			function addTodo () {
				if (newTodo.value) {
					todos.value.push({
						done: false,
						content: newTodo.value
					});
					newTodo.value = '';
				}
				saveData();
			}

			function doneTodo (todo) {
				todo.done = !todo.done
				saveData();
			}

			function removeTodo (index) {
				todos.value.splice(index, 1);
				saveData();
			}

			function saveData () {
				const storageData = JSON.stringify(todos.value);
				localStorage.setItem('todos', storageData);
			}

			return {
				todos,
				newTodo,
				addTodo,
				doneTodo,
				removeTodo,
				saveData
			}
		}
	}
</script>

<style lang="scss">
$border: 2px solid
	rgba(
		$color: white,
		$alpha: 0.35,
	);
$size1: 6px;
$size2: 12px;
$size3: 18px;
$size4: 24px;
$size5: 48px;
$backgroundColor: #27292d;
$textColor: white;
$primaryColor: #a0a4d9;
$secondTextColor: #1f2023;
body {
	margin: 0;
	padding: 0;
	font-family: Avenir, Helvetica, Arial, sans-serif;
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
	background-color: $backgroundColor;
	color: $textColor;
	#app {
		max-width: 600px;
		margin-left: auto;
		margin-right: auto;
		padding: 20px;
		h1 {
			font-weight: bold;
			font-size: 28px;
			text-align: center;
		}
		form {
			display: flex;
			flex-direction: column;
			width: 100%;
			label {
				font-size: 14px;
				font-weight: bold;
			}
			input,
			button {
				height: $size5;
				box-shadow: none;
				outline: none;
				padding-left: $size2;
				padding-right: $size2;
				border-radius: $size1;
				font-size: 18px;
				margin-top: $size1;
				margin-bottom: $size2;
			}
			input {
				background-color: transparent;
				border: $border;
				color: inherit;
			}
		}
		button {
			cursor: pointer;
			background-color: $primaryColor;
			border: 1px solid $primaryColor;
			color: $secondTextColor;
			font-weight: bold;
			outline: none;
			border-radius: $size1;
		}
		h2 {
			font-size: 22px;
			border-bottom: $border;
			padding-bottom: $size1;
		}
		ul {
			padding: 10px;
			li {
				display: flex;
				justify-content: space-between;
				align-items: center;
				border: $border;
				padding: $size2 $size4;
				border-radius: $size1;
				margin-bottom: $size2;
				span {
					cursor: pointer;
				}
				.done {
					text-decoration: line-through;
				}
				button {
					font-size: $size2;
					padding: $size1;
				}
			}
		}
		h4 {
			text-align: center;
			opacity: 0.5;
			margin: 0;
		}
	}
}
</style>

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原文地址：https://blog.csdn.net/pacong/article/details/139392805