Vue 组件化编码流程
- 拆分静态组件：组件要按功能拆分，命名不要与 html 元素冲突
- 实现动态组件：考虑好数据存储位置，数据是单个组件还是多个组件使用
- 单个组件使用数据：放在组件自身即可
- 多个组件使用数据（状态提升）：放在他们共同的父组件上
- 实现交互：从绑定事件开始
props 通信
- 父组件 ==》 子组件 通信
- 子组件 ==》 父组件 通信（要求父先给子一个函数）
使用 v-model 时：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
props 传过来的若是对象类型的值，修改对象中的属性时 Vue 并不会报错但不推荐这样做
实例
哔哩哔哩 《尚硅谷Vue2.0+Vue3.0全套教程丨vuejs从入门到精通》
src 文件结构
|-- src
|-- App.vue
|-- main.js
|-- components
|-- BaseBody.vue
|-- BaseFooter.vue
|-- BaseHeader.vue
|-- BodyItem.vue
App.vue
<template>
<div id="root">
<div class="todo-container">
<div class="todo-wrap">
<BaseHeader :addTodo="addTodo"/>
<BaseBody :todos="todos" :checkTodo="checkTodo" :deleteTod="deleteTod"/>
<BaseFooter :todos="todos" :checkAllTodo="checkAllTodo" :clearAllTodo="clearAllTodo"/>
</div>
</div>
</div>
</template>
<script>
import BaseHeader from "@/components/BaseHeader";
import BaseBody from "@/components/BaseBody";
import BaseFooter from "@/components/BaseFooter";
export default {
name: 'App',
components: {BaseHeader, BaseBody, BaseFooter},
data() {
return {
todos: [
{id: '001', title: '吃饭', done: true},
{id: '002', title: '睡觉', done: false},
{id: '003', title: '喝水', done: true}
]
}
},
methods: {
// 添加一个todo
addTodo(todoObj) {
this.todos.unshift(todoObj)
},
// 勾选or取消勾选一个todo
checkTodo(id) {
this.todos.forEach((todo) => {
if (todo.id === id) todo.done = !todo.done
})
},
// 删除一个todo
deleteTod(id) {
this.todos = this.todos.filter((todo) => {
return todo.id !== id
})
},
// 全选or取消全选
checkAllTodo(done) {
this.todos.forEach((todo) => {
todo.done = done
})
},
// 清除所有已经完成的todo
clearAllTodo(){
this.todos = this.todos.filter((todo)=>{
return !todo.done
})
}
}
}
</script>
<style>
/*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>
main.js
import Vue from 'vue'
import App from './App.vue'
Vue.config.productionTip = false
new Vue({
render: h => h(App),
}).$mount('#app')
BaseBody.vue
<template>
<ul class="todo-main">
<BodyItem
v-for="todoObj in todos"
:key="todoObj.id"
:todo="todoObj"
:checkTodo="checkTodo"
:deleteTod="deleteTod"
/>
</ul>
</template>
<script>
import BodyItem from "@/components/BodyItem";
export default {
name: "BaseBody",
components: {BodyItem},
props: ['todos', 'checkTodo','deleteTod']
}
</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>
BaseFooter.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: "BaseFooter",
props: ['todos', 'checkAllTodo', 'clearAllTodo'],
computed: {
total() {
return this.todos.length
},
doneTotal() {
return this.todos.reduce((pre, todo) => pre + (todo.done ? 1 : 0), 0)
},
isAll: {
get() {
return this.doneTotal === this.total && this.total > 0
},
set(value) {
this.checkAllTodo(value)
}
}
},
methods: {
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>
BaseHeader.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" @keydown.enter="add"/>
</div>
</template>
<script>
import {nanoid} from 'nanoid'
export default {
name: "BaseHeader",
props: ['addTodo'],
data() {
return {
title: ''
}
},
methods: {
add() {
// 校验数据
if (!this.title.trim()) return alert('输入不能为空')
// 将用户输入包装成一个todo对象
const todoObj = {id: nanoid(), title: this.title, done: false}
// 通知 App 组件添加一个todo对象
this.addTodo(todoObj)
// 清空输入
this.title = ''
}
}
}
</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>
BodyItem.vue
<template>
<li>
<label>
<input type="checkbox" :checked="todo.done" @change="handleCheck(todo.id)"/>
<span>{{todo.title}}</span>
</label>
<button class="btn btn-danger" @click="handleDelete(todo.id)">删除</button>
</li>
</template>
<script>
export default {
name: "BaseItem",
// 声明接受todo对象
props: ['todo', 'checkTodo', 'deleteTod'],
methods: {
// 勾选or取消勾选
handleCheck(id) {
// 通知 App 组件将对应的todo对象done值取反
this.checkTodo(id)
},
// 删除
handleDelete(id) {
if (confirm('确定删除吗？')) {
this.deleteTod(id)
}
}
}
}
</script>
<style scoped>
/*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;
margin-top: 3px;
}
li:before {
content: initial;
}
li:last-child {
border-bottom: none;
}
li:hover {
background-color: #ddd;
}
li:hover button {
display: block;
}
</style>
