vue结构图:
vuex为vue的一个插件,用来管理共享数据的,局部数据声明在自己组件内部.
没有使用vuex时,所有共享数据和操作数据的方法都声明在父组件内,数据的通信用props及pubsub等.下面是由vuex改下之前编写的一个小demo:
效果图示:
需求:
header部输入任务,进行添加,在list中显示;
list中每个item项,鼠标移入时,背景变灰并显示delete按钮.点击按钮可删除该项;鼠标移出时,恢复原样;
footer部: 1.根据列表勾选状态及数量显示已完成数和全部数; 2.当已完成数为0时,不显示清除已完成任务按钮; 3.当已完成数等于全部数量时,全选框勾选. 4.当list列表为空时,全选框不勾选; 5.当主动勾选全选时,所有项都勾选,去勾选时所有项去勾选.
项目目录:
代码:
1.main.js
import Vue from 'vue'
import App from './App'
import store from './store'
import './base.css' // 全局引入base.css文件
/*new Vue({
el: '#app',
components: { App },
template: '<App/>',
store // 全局注册store对象
})*/
new Vue({
el: '#app',
render: h => h(App),
store // 全局注册store对象
})
/*new vue({
el: '#app',
render: function (createElement) {
return createElement(App) // <App/>
},
store
})*/
2.App.vue
<template>
<div class="todo-container">
<div class="todo-wrap">
<!-- 传递函数属性(传递性)和绑定事件监听(用于父子组件) -->
<Header /> <!-- 给标签对象绑定addProject事件监听 -->
<List />
<todo-footer />
</div>
</div>
</template>
<script>
import Header from './components/Header'
import List from './components/List'
import TodoFooter from './components/Footer'
export default {
name: 'App',
mounted() {
// 异步获取projects数据并显示: 发送命令给actions
this.$store.dispatch('reqProjects')
},
components: { Header, List, TodoFooter},
}
</script>
<style>
/*app*/
.todo-container {
width: 600px;
margin: 0 auto;
}
.todo-container .todo-wrap {
padding: 10px;
border: 1px solid #ddd;
border-radius: 5px;
}
</style>
3.Head.vue
<template>
<div class="todo-header">
<input type="text" placeholder="请输入你的任务名称，按回车键确认"
@keyup.enter="addItem" v-model="content"/>
</div>
</template>
<script>
export default {
props: {
// addProject: Function
},
data () {
return {
content: '', // 组件内部使用的状态,不存在共享的问题 --> 不需要使用vuex管理
}
},
methods: {
addItem () {
// 1.检查输入的合法性
const content = this.content.trim()
if (!content) { // content默认不为空字符串,可不写 === ''
alert("不能为空")
return
}
// 2.根据输入生成一个project对象
const project = {
content: this.content,
complete: false
}
// 3.将对象添加到projects中
// this.addProject(project)
// 触发自定义事件:addProject; 只能用在父子组件,不能跨代通信
// this.$emit('addProject',project)
this.$store.dispatch('addProject', project)
// 4.清空输入
this.content = ''
}
}
}
</script>
<style>
/*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>
4.List.vue
<template>
<ul class="todo-main">
<Item v-for="(project,index) in projects" :key="index" :project="project"
:index="index" />
</ul>
</template>
<script>
import Item from "../components/Item";
import {mapState} from 'vuex'
import storageUtil from '../utils/storageUtil'
export default {
name: 'List',
computed: {
...mapState(['projects'])
},
watch: { // 监视
projects: {
deep: true, // 深度监视
/*handler: function (val) {
// 将projects最新的值的json数据保存到localStorage
// window.localStorage.setItem('project_key', JSON.stringify(val))
storageUtil.saveProjects(val)
}*/
handler: storageUtil.saveProjects
}
},
components: {Item},
}
</script>
<style>
/*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>
5.Item.vue
<template>
<!-- onmouseover="" onmouseout="" -->
<li @mouseenter="handleEnter(true)" @mouseleave="handleEnter(false)" :style="{background: bgColor}">
<label>
<input type="checkbox" v-model="project.complete"/>
<span>{{project.content}}</span>
</label>
<button class="btn btn-danger" v-show="isShow" @click="deleteItem">删除</button>
</li>
</template>
<script>
export default {
name: 'Item',
props: {
project: Object,
index: Number,
},
data () {
return {
bgColor: 'white',
isShow: false
}
},
methods: {
handleEnter (isEnter) {
if (isEnter) {
this.bgColor = '#aaaaaa'
this.isShow = true
}else {
this.bgColor = 'white'
this.isShow = false
}
},
deleteItem () {
const {project, index} = this
if (window.confirm(`确认删除${project.content}吗`)) {
this.$store.dispatch('deleteProject',index)
}
}
}
}
</script>
<style>
/*item*/
li {
list-style: none;
height: 36px;
line-height: 36px;
padding: 0 5px;
border-bottom: 1px solid #ddd;
}
li label {
float: left;
cursor: pointer;
}
li label li input {
vertical-align: middle;
margin-right: 6px;
position: relative;
top: -1px;
}
li button {
float: right;
display: none;
margin-top: 3px;
}
li:before {
content: initial;
}
li:last-child {
border-bottom: none;
}
</style>
6.Footer.vue
<template>
<div class="todo-footer">
<label>
<input type="checkbox" v-model="isAllCheck"/>
</label>
<span>
<span>已完成{{completeSize}}</span> / 全部{{totalSize}}
</span>
<button class="btn btn-danger" v-show="completeSize" @click="deleteAllComplete">清除已完成任务</button>
</div>
</template>
<script>
import {mapGetters,mapActions} from 'vuex'
export default {
name: 'Footer',
computed: {
...mapGetters(['completeSize','totalSize']),
isAllCheck: {
get () { //获取多选框的值,当已完成数等于全部数量且已完成数大于0时,勾选(默认>0,可以不写)
return this.$store.getters.isAllSelect
},
set (value) { //监视多选框的值,value是当前多选框最新的值
this.$store.dispatch('setSelect',value)
}
}
},
methods: {
...mapActions(['deleteAllComplete'])
}
}
</script>
<style>
/*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>
7.index.js
/**
* vuex最核心的管理对象store
*/
import Vue from 'vue'
import Vuex from 'vuex'
import state from './state'
import mutations from './Mutations'
import actions from './Actions'
import getters from './getters'
Vue.use(Vuex)
export default new Vuex.Store({
state,
mutations,
actions,
getters
})
8.actives.js
/**
* 包含n个用于间接更新状态的方法的对象模块
*/
import {ADD_PROJECT, DEL_PROJECT, SELECT_ALL_PROJECT, DELETE_COMPLETE_PROJECT, RECEIVE_PROJECTS} from './mutations-types'
import storageUtil from '../utils/storageUtil'
export default {
addProject( {commit}, project){ //添加project
// 提交对mutations的请求
commit(ADD_PROJECT, project)
},
deleteProject( {commit}, index){ //根据index删除project
// 提交对mutations的请求
commit(DEL_PROJECT, index)
},
setSelect ({commit}, check) { //根据全选框值设置多选框是否勾选
commit(SELECT_ALL_PROJECT, check)
},
deleteAllComplete ({commit}) { //删除所有完成的任务
commit(DELETE_COMPLETE_PROJECT)
},
reqProjects({commit}) { // 异步获取projects并更新状态
// 模拟
setTimeout(() => {
// 读取数据
const projects = storageUtil.readProjects()
// 提交
commit('receive_projects', projects)
},1000)
}
}
9.mutations-types.js
/**
* 所有mutations的名称常量
* @type {string}
*/
export const ADD_PROJECT = 'add_project' // 添加project
export const DEL_PROJECT = 'del_project' // 删除project
export const SELECT_ALL_PROJECT = 'select_all_project' // 全选/全不选projects
export const DELETE_COMPLETE_PROJECT = 'delete_complete_project' // 删除所有选中的
export const RECEIVE_PROJECTS = 'receive_projects' // 接受projects
10.mutations.js
/**
* 包含n个用于直接更新状态的方法的对象模块
*/
import {ADD_PROJECT, DEL_PROJECT, SELECT_ALL_PROJECT, DELETE_COMPLETE_PROJECT, RECEIVE_PROJECTS} from './mutations-types'
export default {
[ADD_PROJECT](state, project) { // 将常量转为变量用 []
state.projects.unshift(project)
},
[DEL_PROJECT](state, index) {
state.projects.splice(index, 1)
},
[SELECT_ALL_PROJECT](state, check) {
//根据全选框值设置多选框是否勾选
state.projects.forEach(project => project.complete = check)
},
[DELETE_COMPLETE_PROJECT](state) {
//将project中complete为true的过滤掉,留下false为一个新的数组,重新赋值
state.projects = state.projects.filter(project => !project.complete)
},
[RECEIVE_PROJECTS](state, projects) {
state.projects = projects
}
}
11.state.js
/**
* 状态对象模块
*/
export default {
// 从localStorage中读取数据
projects: []
}
12.getters.js
/**
* 包含n个基于state的getter计算属性方法的对象模块
*/
export default {
// 完成的数量
completeSize (state) {
// 遍历projects,初始化preTotal为0,若project.complete为true则加1,返回最终preTotal值
return state.projects.reduce((preTotal, project) => preTotal + (project.complete ? 1 : 0), 0)
},
// 总数量
totalSize (state) {
return state.projects.length
},
// 判断是否需要全选
isAllSelect (state, getters) { // 用this获取不到当前对象方法,用getters
return getters.completeSize === getters.totalSize && getters.completeSize
}
}
13.storageUtil.js
/**
* 使用localStorage存储数据的工具模块
* 1.函数
* 2.模块
* 需要向外暴露一个功能还是多个功能
*/
const PROJECTS_KEY = 'project_key'
export default {
saveProjects(val) {
window.localStorage.setItem(PROJECTS_KEY, JSON.stringify(val))
},
readProjects() {
return JSON.parse(window.localStorage.getItem(PROJECTS_KEY) || '[]');
}
}
14.base.css
/*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;
}
15.index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1.0">
<title>vuex_demo</title>
<link rel="stylesheet" href="./static/css/bootstrap.css">
<style>
.router-link-active {
color: red !important;
}
</style>
</head>
<body>
<div id="app"></div>
<!-- built files will be auto injected -->
</body>
</html>