TodoList

学习笔记：
总结TodoList案例

1.组件化编码流程:

(1).拆分静态组件:组件要按照功能点拆分，命名不要与htm|元素冲突。

(2).实现动态组件:考虑好数据的存放位置，数据是一个组件在用， 还是一些组件在用: .

1).-个组件在用:放在组件自身即可。

2). -些组件在用:放在他们共同的父组件上(状态提升)。(3).实现交互:从绑定事件开始。

2. props适用于:

(1).父组件==>子组件通信

(2).子组件==>父组件通信(要求父先给子-一个函数)

3.使用v-model时要切记: v-model绑定的值不能是props传过来的值,因为props是不可以修改的!

4. props传过来的若是对象类型的值，修改对象中的属性时Vue不会报错,但不推荐这样做。

运行截图：
全选和取消全选，相应的全选或取消全选后全选按钮作出相应的反应：


增加

删除

清除已经完成的，全部清除后底部消失：


组件结构：

本项目是在vue-cil5,vue2,nanoid环境下运行

源码：

main.js

import Vue from 'vue'
import App from './App.vue'

Vue.config.productionTip = false

new Vue({
render: h => h(App),
}).$mount('#app')

app.vue

<template>
 <div id="app">
   <div class="todo-container">
   	<div class="todo-wrap">
   		<myHeader :addTodo="addTodo"/>
   		<myList :todos="todos" :checkTodo="checkTodo" :deleteTodo="deleteTodo"/>
   		<myFoot :datas="todos" :checkAll="checkAll" :clearAlldone="clearAlldone"/>
   	</div>
   </div>
 </div>
</template>

<script>
import myHeader from "./components/myHeader.vue"
import myList   from "./components/myList.vue"
import myFoot   from "./components/myFoot.vue"
export default {
 name: 'App',
 data(){
 	return{
 		todos:
   	[{id:"001",title:"睡觉",done:true},
 		{id:"002",title:"开车",done:false},
 		{id:"003",title:"吹牛",done:true}]
 	}
 },
 methods:{
   addTodo(todoObj){
   	const obj=todoObj;
   	this.todos.unshift(obj);
   },
   checkTodo(id){
   	this.todos.forEach((todo)=>{
   		if(todo.id==id)
   		todo.done=!todo.done
   	})
   },
   deleteTodo(id){
   	this.todos=this.todos.filter((todo)=>{
   		return todo.id!=id
   	})
   },
   checkAll(done){
   	this.todos.forEach((to)=>{
   		to.done=done
   	})
   },
   clearAlldone(){
   	this.todos=this.todos.filter((a)=>{
   		return !a.done
   	})
   }
 },
 components: {
  myHeader,
  myList,
  myFoot
 }
 
}
</script>

<style>
#app {
 font-family: Avenir, Helvetica, Arial, sans-serif;
 -webkit-font-smoothing: antialiased;
 -moz-osx-font-smoothing: grayscale;
 color: #2c3e50;
 margin-top: 60px;
}

body{
    background: #fff;
}
.btn{
    display: inline-block;
    margin-bottom: 0;
    padding: 4px 12px;
    font-size: 14px;
    line-height: 20px;
    text-align: center;
    vertical-align: middle;
    cursor: pointer;
    box-shadow: inset 0 1px 0 rgba(0, 0, 0, 0.2), 0 1px 2px rgba(0,0,0,0.3);
}
.btn-danger{
    color: #fff;
    background-color:#da4f49;
    border:1px solid #ba362f;
   
}
.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

<template>
	<div class="todo-header">
		<input type="text" placeholder="请输入你的任务名称,按回车生成" @keyup.enter="add" v-model="title"/>
	</div>
</template>

<script>
	import {nanoid} from "nanoid"
	export default{
		name:"myHead",
		props:["addTodo"],
		data(){
			return{
				title:""
			}
		},
		methods:{
			add(){
				if(this.title.trim()!=""){
					const todoobj={id:nanoid(),title:this.title,done:false}
					this.addTodo(todoobj)					
					this.title=""
				}		
				else{
					alert("不能为空啊")
				}
			}
		},
		
	}
</script>

<style scoped>
	.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(80,160,231,0.7);
		box-shadow: inset 0 1px 1px rgba(0,0,0,0.075),0 0 8px rgba(80,160,231,0.7);
	}
</style>

myList

<template>
		<ul class="todo-main">
			<myItem 
			v-for="t in todos" 
			:key="t.id" 
			:todo="t" 
			:checkTodo="checkTodo"
			:deleteTodo="deleteTodo"/>
		    
		</ul>
</template>

<script>
	import myItem from "./myItem.vue"
	export default {
		name:"myList",
		components:{
			myItem,
		},
		props:["todos","checkTodo","deleteTodo"]
	}
</script>

<style>
   .todo-main{
	   border:1px #bbb solid;
	   
   }
</style>

myFoot

<template>
	<div class="todo-footer" v-if="total">
		<label ><input type="checkbox" v-model="istotal"/>
		</label>
		<span>
			<span>已完成{
   {donetotal}}</span>/全部{
   {total}}
		</span>
		<button class="btn btn-dabger" @click="cleardone">清除已完成任务</button>
	</div>
</template>

<script>
	export default {
		name:"myFoot",
		props:["datas","checkAll","clearAlldone"],
		computed:{
			total(){
				return this.datas.length
			},
			donetotal(){
				let total=this.datas.filter((t)=>{
					return t.done
				}).length
				return total
			},
			istotal:{
				get(){
					return this.total==this.donetotal&&this.total>0 ? true:false;
				},
				set(value){
					this.checkAll(value)
				}
			}
		},
		methods:{
			cleardone(){
				this.clearAlldone()
			}
		}
		
	}
</script>

<style scoped>
	.todo-footer{
		position: relative;
	}
	.todo-footer .btn{
		position: absolute;
		right: 10px;
		top: -5px;
		border-radius: 3px;
		background-color: #e7064d;
		border: 1px #d8235a solid;
		color: white;		
	}
	.todo-footer .btn:hover{
		transform: scale(1.01);
	}
	.todo-footer span{
		margin-left: 10px;
	}
	
</style>

myItem

<template>
	<div class="todo-footer" v-if="total">
		<label ><input type="checkbox" v-model="istotal"/>
		</label>
		<span>
			<span>已完成{
   {donetotal}}</span>/全部{
   {total}}
		</span>
		<button class="btn btn-dabger" @click="cleardone">清除已完成任务</button>
	</div>
</template>

<script>
	export default {
		name:"myFoot",
		props:["datas","checkAll","clearAlldone"],
		computed:{
			total(){
				return this.datas.length
			},
			donetotal(){
				let total=this.datas.filter((t)=>{
					return t.done
				}).length
				return total
			},
			istotal:{
				get(){
					return this.total==this.donetotal&&this.total>0 ? true:false;
				},
				set(value){
					this.checkAll(value)
				}
			}
		},
		methods:{
			cleardone(){
				this.clearAlldone()
			}
		}
		
	}
</script>

<style scoped>
	.todo-footer{
		position: relative;
	}
	.todo-footer .btn{
		position: absolute;
		right: 10px;
		top: -5px;
		border-radius: 3px;
		background-color: #e7064d;
		border: 1px #d8235a solid;
		color: white;		
	}
	.todo-footer .btn:hover{
		transform: scale(1.01);
	}
	.todo-footer span{
		margin-left: 10px;
	}
	
</style>

这给小项目作为vue新手练手组件化开发还是很不错的，这个项目b站上面有尚硅谷的课可以免费看(我只是一名普通的网友啊)
https://www.bilibili.com/video/BV1Zy4y1K7SH?p=70