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html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).一个组件在用:放在组件自身即可。
2).一些组件在用: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。- 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。
APP.VUE
<template>
<div id="app">
<div id="root">
<div class="todo-container">
<div class="todo-wrap">
<!-- 头部搜索框组件 -->
<headerModule :receive="receive"/>
<listModule :todos="todos" :checkTodo="checkTodo" :deleteTodo="deleteTodo"></listModule>
<footerModule :todos="todos" :checkAllTodo="checkAllTodo" :clearAllTodo="clearAllTodo"></footerModule>
</div>
</div>
</div>
</div>
</template>
<script>
// import的名称就是组件的name
import headerModule from './components/Header.vue'
import listModule from './components/List.vue'
import footerModule from './components/Footer.vue'
export default {
name: 'App',
data(){
return{
todos:[
{id:'001',title:'吃饭',done:true},
{id:'002',title:'睡觉',done:false},
{id:'003',title:'打游戏',done:true},
{id:'004',title:'上课',done:false},
]
}
},
components: {
headerModule,
listModule,
footerModule
},
methods:{
// 添加数据
receive(x){
this.todos.unshift(x)
},
// 改变复选框
checkTodo(id){
this.todos.forEach((todo)=>{
if(todo.id==id){
todo.done=!todo.done
}
})
},
// 删除数据
deleteTodo(id){
this.todos=this.todos.filter(
function(todo){
return todo.id !==id
}
)
},
// 全选按钮
checkAllTodo(done){
this.todos.forEach((todo)=>{
todo.done=done
})
},
clearAllTodo(){
this.todos=this.todos.filter((todo)=>{
return !todo.done
})
}
}
}
</script>
<style>
#app {
font-family: Avenir, Helvetica, Arial, sans-serif;
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale;
text-align: center;
color: #2c3e50;
margin-top: 60px;
}
/*分割线 */
/*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>
Header.VUE
<template>
<div class="todo-header">
<input v-model="title" @keyup.enter="add" type="text" placeholder="请输入你的任务名称，按回车键确认"/>
</div>
</template>
<script>
import {nanoid} from 'nanoid'
export default {
name:'headerModule',
data(){
return{
title:''
}
},
methods:{
add(e){
if(!this.title.trim())return
const todoObj={
id:nanoid(),
title:this.title,
done:false
}
this.receive(todoObj)
this.title=''
}
},
props:['receive'],
}
</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>List.VUE
<template>
<ul class="todo-main">
<itemModule
v-for="todoObj in todos"
:key=todoObj.id
:todo="todoObj"
:checkTodo="checkTodo"
:deleteTodo="deleteTodo"
>
</itemModule>
</ul>
</template>
<script>
import itemModule from './Item.vue'
export default {
name:'listModule',
components:{
itemModule
},
props:['todos','checkTodo','deleteTodo']
}
</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>Item.vue
<template>
<li>
<label>
<input type="checkbox" :checked='todo.done' @change="gaibian(todo.id)"/>
<span>{{todo.title}}</span>
</label>
<button class="btn btn-danger" @click="del(todo.id)" >删除</button>
</li>
</template>
<script>
export default {
name:'itemModule',
props:['todo','checkTodo','deleteTodo'],
methods:{
gaibian(id){
// 通知app改变复选框状态
this.checkTodo(id)
},
del(id){
if(confirm('确定要删除信息吗?')){
// 通知app删除数组数据
this.deleteTodo(id)
}
}
}
}
</script>
<style scoped>
/*item*/
li {
list-style: none;
height: 36px;
line-height: 36px;
padding: 0 5px;
border-bottom: 1px solid #ddd;
}
li:hover{
background-color: #ddd;
}
li:hover button{
display: block;
}
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;
}
</style>Footer.Vue
<template>
<div class="todo-footer" v-show="todos.length"><!--如果length有长度就是为真，例如123456都是真，如果长度为0那就是假，v-show是靠真假来显示隐藏的，绝了。-->
<label>
<input type="checkbox" :checked='isAll' @change="checkAll"/>
</label>
<span>
<span>已完成{{doneTotal}}</span> / 全部{{todos.length}}
</span>
<button class="btn btn-danger" @click="clearAll">清除已完成任务</button>
</div>
</template>
<script>
export default {
props:['todos','checkAllTodo','clearAllTodo'],
name:'footerModule',
computed:{
doneTotal(){
return this.todos.filter(todo=>todo.done).length//用filter将done值为ture的筛选出来复制给一个新的数组，然后再取这个数组的length长度。
},
isAll(){
return this.doneTotal===this.todos.length && this.todos.length>0
}
},
methods:{
checkAll(e){
this.checkAllTodo(e.target.checked)
},
clearAll(){
this.clearAllTodo()
}
}
}
</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>
