vue分类页开发--axios数据获取，localstorage数据缓存
程序员文章站
2022-03-25 17:37:32
效果图 1、首先在app.vue中，给路由添加keep-alive，使其能够被缓存 2、配置路由 router/index.js 3、书写各部分组件 src/pages/category/header.vue
效果图
1、首先在app.vue中，给路由添加keep-alive，使其能够被缓存
2、配置路由 router/index.js
3、书写各部分组件
src/pages/category/header.vue
<template>
<div class="header">
<i class="iconfont icon-scan header-left"></i>
<div class="header-center">搜索框</div>
<i class="iconfont icon-msg header-right"></i>
</div>
</template>
<script>
export default {
name:'categoryheader'
}
</script>
<style lang="scss" scoped>
.header{
background-color:rgba(222, 24, 27, 0.9);
transition:background-color 0.5s;
display: flex;
justify-content: space-between;
align-items: center;
padding:5px 20px;
.iconfont{
font-size:24px;
color:#fff;
}
.header-center{
flex:1;
}
}
</style>
src/pages/category/tab.vue
<template>
<div class="tab-container">
<ul class="tab">
<li class="tab-item" :class="{'tab-item-active':item.id===curid}" v-for="(item,index) in items" :key="index" @click="switchtab(item.id)">
{{item.name}}
</li>
</ul>
</div>
</template>
<script>
import {categorynames} from './config';
export default {
name:'categorytab',
data(){
return{
items:categorynames,
curid:""
}
},
created(){
this.switchtab(this.items[0].id);
},
methods:{
switchtab(id){
this.curid=id;
this.$emit("switch-tab",id);//派发事件，传递id
}
}
}
</script>
<style lang="scss" scoped>
.tab-container{
width:100%;
height:100%;
overflow:auto;
}
.tab {
width: 100%;
height:auto;
&-item {
height: 46px;
background-color: #fff;
border-right: 1px solid #e5e5e5;
border-bottom: 1px solid #e5e5e5;
color: #080808;
font-size: 14px;
font-weight: bold;
text-align: center;
line-height: 46px;
overflow: hidden;
text-overflow: ellipsis;
white-space: nowrap;
&:last-child {
border-bottom: none;
}
}
&-item-active {
background: none;
border-right: none;
color: #f23030;
}
}
</style>
src/pages/category/content.vue
<template>
<div class="content-wrapper">
<div class="loading-container" v-if="isloading">
<div class="loading-wrapper">
<me-loading/>
</div>
</div>
<scrollbar ref="scroll" @pull-up="pullup" @pull-down="pullrefresh">
<div class="content">
<div class="pic" v-if="content.banner">
<a :href="content.banner.linkurl" class="pic-link">
<img @load="updatescroll" :src="content.banner.picurl" class="pic-img">
</a>
</div>
<div class="section" v-for="(section, index) in content.data" :key="index" >
<h4 class="section-title">{{section.name}}</h4>
<ul class="section-list">
<li class="section-item" v-for="(item, i) in section.itemlist" :key="i" >
<a :href="item.linkurl" class="section-link">
<p class="section-pic" v-if="item.picurl">
<img v-lazy="item.picurl" class="section-img" />
</p>
<p class="section-name">{{item.name}}</p>
</a>
</li>
</ul>
</div>
</div>
</scrollbar>
<div class="g-backtop-container">
<me-backtop :visible="backtopvisible" @backtop="backtop" />
</div>
</div>
</template>
<script>
import {getcategorys} from 'api/category';
import meloading from 'components/loading';
import scrollbar from 'components/scroll';
import mebacktop from 'components/backtop';
import storage from 'assets/js/storage.js';
import {category_content_key,category_content_update_time} from './config';
export default {
name:'categorycontent',
components:{
meloading,
scrollbar,
mebacktop,
},
props:{
curid:{
type:string,
default:''
}
},
data(){
return{
content:{},
isloading:false,
backtopvisible:false,
}
},
watch:{
curid(id){
this.isloading=true;
this.getcontent(id).then(()=>{
this.isloading=false;
this.backtop();//回到顶部
});
}
},
methods:{
getcontent(id){
let content=storage.get(category_content_key);
let updatetime;
const curtime=new date().gettime();
if(content && content[id]){
updatetime=content[id].updatetime||0;
if(curtime-updatetime<category_content_update_time){//未超时
console.log('从缓存获取');
return this.getcontentbystorage(content[id]);//从缓存获取
}else{
console.log('从服务器获取');
return this.getcontentbyhttp(id).then(()=>{//从服务器获取
this.updatestorage(content,id,updatetime);//更新缓存
});
}
}else{
console.log('从服务器获取');
return this.getcontentbyhttp(id).then(()=>{//从服务器获取
this.updatestorage(content,id,curtime);//更新缓存
});
}
},
getcontentbystorage(content){
this.content=content.data;
return promise.resolve();//返回一个成功的promise对象
},
getcontentbyhttp(id){
return getcategorys(id).then(data=>{
return new promise(resolve=>{
if(data){
this.content=data.content;
resolve();
}
})
})
},
updatestorage(content,id,curtime){
//content=content || {};
content[id]={};
content[id].data=this.content;
content[id].updatetime=curtime;
storage.set(category_content_key,content);
},
updatescroll(){
this.$refs.scroll && this.$refs.scroll.update();
},
scrollend(translate,swiper,pulling){//下拉刷新结束
//显示回到顶部按钮
this.backtopvisible=translate<0 && -translate>swiper.height;//向下拉并且距离大于一屏
},
backtop(){
this.$refs.scroll && this.$refs.scroll.scrolltop();//回到顶部
},
pullup(end){
end();
},
pullrefresh(end){
this.getcontent(this.curid).then(()=>{
this.isloading=false;
this.backtop();//回到顶部
end();
});
}
}
}
</script>
<style lang="scss" scoped>
.g-backtop-container{
position: absolute;
z-index:1100;
right:10px;
bottom:60px;
}
.content-wrapper {
position: relative;
height: 100%;
}
.loading-container {
position: absolute;
top: 0;
left: 0;
z-index: 1190;
display: flex;
justify-content: center;
align-items: center;
flex-direction: row;
width: 100%;
height: 100%;
.mine-loading {
color: #fff;
font-size: 14px;
}
}
.loading-wrapper {
width: 50%;
padding: 30px 0;
background-color: rgba(0, 0, 0, 0.4);
border-radius: 4px;
}
.content {
padding: 10px;
}
.pic {
margin-bottom: 12px;
&-link {
display: block;
}
&-img {
width: 100%;
}
}
.section {
margin-bottom: 12px;
&:last-child {
margin-bottom: 0;
}
&-title {
height: 28px;
line-height: 28px;
color: #080808;
font-weight: bold;
}
&-list {
display: flex;
flex-wrap: wrap;
background-color: #fff;
padding: 10px 10px 0;
}
&-item {
width: (100% / 3);
}
&-link {
display: block;
}
&-pic {
position: relative;
width: 80%;
padding-bottom: 80%;
margin: 0 auto;
}
&-img {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
}
&-name {
height: 36px;
line-height: 36px;
text-align: center;
overflow: hidden;
text-overflow: ellipsis;
white-space: nowrap;
}
}
.g-backtop-container {
bottom: 10px;
}
</style>
src/pages/category/index.vue
<template>
<div class="category">
<div class="g-header-container">
<category-header />
</div>
<div class="g-content-container">
<div class="sidebar">
<category-tab @switch-tab="getcurid" />
</div>
<div class="main">
<category-content :curid="curid" />
</div>
</div>
</div>
</template>
<script>
import categoryheader from './header';
import categorytab from './tab';
import categorycontent from './content';
export default {
name:'category',
components:{
categoryheader,
categorytab,
categorycontent
},
data(){
return{
curid:''
}
},
methods:{
getcurid(id){
this.curid=id;
}
}
}
</script>
<style lang="scss" scoped>
html,body{
width:100%;
height:100%;
}
.category {
overflow:hidden;
width:100%;
height:100%;
background-color: '#f5f5f5';
}
.g-content-container {
width:100%;
height:100%;
display: flex;
}
.sidebar {
width: 80px;
height: 100%;
}
.main {
flex: 1;
height: 100%;
}
</style>
4、储存常量和服务器获取来的数据
src/pages/category/config.js
export const category_content_key='cyymall-category-content-key';
export const category_content_update_time=1*24*60*60*1000;//1天
export const categorynames = [
{
'name': '热门推荐',
'id': 'wqr2006'
},
{
'name': '慕淘超市',
'id': 'wq1968'
},
{
'name': '国际名牌',
'id': 'wq1969'
},
{
'name': '奢侈品',
'id': 'wq1970'
},
{
'name': '全球购',
'id': 'wq1971'
},
{
'name': '男装',
'id': 'wq1972'
},
{
'name': '女装',
'id': 'wq1973'
},
{
'name': '男鞋',
'id': 'wq1974'
},
{
'name': '女鞋',
'id': 'wq1975'
},
{
'name': '内衣配饰',
'id': 'wq1976'
},
{
'name': '箱包手袋',
'id': 'wq1977'
},
{
'name': '美妆个护',
'id': 'wq1978'
},
{
'name': '钟表珠宝',
'id': 'wq1979'
},
{
'name': '手机数码',
'id': 'wq1980'
},
{
'name': '电脑办公',
'id': 'wq1981'
},
{
'name': '家用电器',
'id': 'wq1982'
},
{
'name': '食品生鲜',
'id': 'wq1983'
},
{
'name': '酒水饮料',
'id': 'wq1984'
},
{
'name': '母婴童鞋',
'id': 'wq1985'
},
{
'name': '玩具乐器',
'id': 'wq1986'
},
{
'name': '医药保健',
'id': 'wq1987'
},
{
'name': '计生情趣',
'id': 'wq1988'
},
{
'name': '运动户外',
'id': 'wq1989'
},
{
'name': '汽车用品',
'id': 'wq1990'
},
{
'name': '家居厨具',
'id': 'wq1991'
},
{
'name': '家具家装',
'id': 'wq1992'
},
{
'name': '礼品鲜花',
'id': 'wq1993'
},
{
'name': '宠物生活',
'id': 'wq1994'
},
{
'name': '生活旅行',
'id': 'wq1995'
},
{
'name': '图书音像',
'id': 'wq1996'
},
{
'name': '邮币',
'id': 'wq1997'
},
{
'name': '农资绿植',
'id': 'wq1998'
},
{
'name': '特产馆',
'id': 'wq1999'
},
{
'name': '慕淘金融',
'id': 'wq2000'
},
{
'name': '拍卖',
'id': 'wq2001'
},
{
'name': '房产',
'id': 'wq2008'
},
{
'name': '二手商品',
'id': 'wq2002'
}
];
5、axios获取数据
src/api/category.js
import axios from 'axios';
// canceltoken：快速发送多个请求时，取消前面的请求，以最后一个为准
const canceltoken=axios.canceltoken;
let cancel;
//获取数据 ajax
export const getcategorys=(id)=>{
cancel && cancel("取消了前一次请求");
cancel=null;
let url='http://www.imooc.com/api/category/content/'+id;
return axios.get(url,{
canceltoken:new canceltoken(function executor(c){
cancel=c;
})
}).then(res=>{
if(res.data.code===0){
console.log("获取category成功");
return res.data;
}
throw new error('没有成功获取到数据');
}).catch(err=>{
console.log(err);
});
}
6、localstorage操作缓存
const storage = window.localstorage;
export default {
set(key, val) {
if (val === undefined) {
return;
}
storage.setitem(key, serialize(val));
},
get(key, def) {
const val = deserialize(storage.getitem(key));
return val === undefined ? def : val;
},
remove(key) {
storage.removeitem(key);
},
clear() {
storage.clear();
}
};
function serialize(val) {
return json.stringify(val);
}
function deserialize(val) {
if (typeof val !== 'string') {
return undefined;
}
try {
return json.parse(val);
} catch (e) {
return val || undefined;
}
}
最后补充一下，关于 $nexttick