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【愚公系列】2022年09月 微信小程序-图片懒加载功能实现_在uniapp中使用npm install --save mina-lazy-image
作者：我家自动化 | 2024-03-27 02:21:39
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在uniapp中使用npm install --save mina-lazy-image
前言
大型电商，一个页面会存在非常多的图片，一次性加载图片会很慢，用户体验度不好，而图片懒加载是为了提这些网页的打开的速度，获得更好用户体验的一种手段。其选择的重要的部分先加载，次要的部分需要的时候再加载。
一、官方图片的懒加载
相关图片的API和简单案例可参考：https://codeboy.blog.csdn.net/article/details/123921262
1.wxml
<view class="page-section">
<text class="page-section__title">use image</text>
<scroll-view class="cardbox">
<button
wx:if="{{item.live.play_urls}}"
class="card"
hover-class='none'
wx:for="{{content}}"
wx:key="*this"
bindtap="gotoLive"
data-url="{{item.live.play_urls.hdl.ORIGIN}}"
data-ava="{{item.live.user_info.avatar}}"
data-name="{{item.live.user_info.name}}"
data-audience="{{item.live.audience_num}}"
data-lid="{{item.live.id}}"
data-cacheprepic="{{item.live.pic}}"
data-prepic="{{item.live.pic_320}}"
data-share_desc="{{item.live.share_info.wechat_contact.cn.text}}"
style="position: relative;"
>
<view class="image_card">
<image class="showpic" mode="aspectFill" src="{{item.live.pic_320}}" lazy-load="{{true}}" />
<view class="cover" />
<text class="audience">{{item.live.audience_num}}观众</text>
</view>
<view class="user_card" catchtap="gotoHome" data-uid="{{item.live.user_info.id}}">
<view class="avabox">
<image src="{{item.live.user_info.avatar}}" lazy-load="{{true}}" class="ava" data-uid="{{item.live.user_info.id}}" />
<image class="vip" wx:if="{{item.live.vip}}" lazy-load="{{true}}" src="http://img08.oneniceapp.com/upload/resource/9e7ca7ece11143b49fc952cfb2520e43.png" />
</view>
<text class="user_name">{{item.live.user_info.name}}</text>
</view>
</button>
<button
wx:if="{{item.live.playback_urls}}"
class="card"
open-type='getUserInfo'
bindtap="gotoPlayback"
wx:for="{{content}}"
data-url="{{item.live.playback_urls.hls.ORIGIN}}"
wx:key="*this"
>
<view class="image_card">
<image className="showpic" mode="aspectFill" src="{{item.live.pic_320}}" lazy-load="{{true}}" />
<view class="cover" />
<text class="audience">{{item.live.audience_num}}观众</text>
<image class="back" lazy-load="{{true}}" src="http://img08.oneniceapp.com/upload/resource/002bdceaa732f300e33ab8b2cb84dd17.png" />
</view>
<view class="user_card">
<view class="avabox">
<image src="{{item.live.user_info.avatar}}" class="ava" lazy-load="{{true}}" />
<image class="vip" wx:if="{{item.live.vip}}" lazy-load="{{true}}" src="http://img08.oneniceapp.com/upload/resource/9e7ca7ece11143b49fc952cfb2520e43.png" />
</view>
<text class="user_name">{{item.live.user_info.name}}</text>
</view>
</button>
</scroll-view>
</view>
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2.js
const app = getApp()
Page({
/**
* 页面的初始数据
*/
data: {
},
onLoad: function () {
wx.request({
url: 'https://wxapi.kkgoo.cn/live/discover?type=hot',
method:'POST',
success:(res) => {
console.log(res)
this.setDis(res);
}
})
},
setDis(r) {
let newData = r.data.data;
this.data.nextKey = newData.nextkey ? newData.nextkey : this.data.nextKey;
this.setData({
content: newData.discover ? newData.discover : this.data.content,
banneritem: newData.cards ? newData.cards.slice(0, newData.cards.length - 1) : this.data.banneritem
})
},
previewImage(e){
console.log(e);
let url = e.currentTarget.dataset.url
wx.previewImage({
current:url,
urls: [url],
})
}
})
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3.css
.lazy-image{
}
/* 用户列表相关样式 */
.main{
font-size:0;
width:100%;
height: 100%;
font-family: 'PingFangSC-Semibold';
}
.title{
text-align:center;
font-size: 0;
}
.u_title{
display: inline-block;
width:100%;
font-size: 24rpx;
line-height: 24rpx;
margin:20rpx 0;
font-weight: bold;
}
.d_title{
display: inline-block;
width:100%;
line-height: 22rpx;
font-size: 22rpx;
}
.cardbox{
width: 100%;
font-size: 0;
box-sizing: border-box;
padding: 0 32rpx;
/*margin-top:60rpx;*/
display: inline-block;
}
button::after{
border: none
}
button{
width: auto !important;
padding-left: 0 !important;
padding-right: 0 !important;
background-color: #fff;
}
.card{
display: inline-block;
float:left;
/* margin-top:60rpx; */
}
.card .image_card{
width: 268rpx;
height: 268rpx;
border-radius: 8rpx;
position: relative;
}
.cover{
position: absolute;
/* width: 327rpx;
height: 327rpx; */
top: 0;
left: 0;
background-color: rgba(0,0,0,0.3);
z-index: 99;
border-radius: 8rpx;
}
.card .image_card .audience{
font-size: 22rpx;
color:#fff;
position: absolute;
left:16rpx;
top:16rpx;
z-index:999;
font-weight: bold;
}
.card .image_card .back{
position: absolute;
right:16rpx;
top:16rpx;
width: 56rpx;
height: 32rpx;
z-index: 999;
}
.card .user_card{
margin-top: 20rpx;
margin-bottom: 20rpx;
float:left;
margin-right: 15rpx;
}
.card .user_card .avabox{
width:48rpx;
height: 48rpx;
margin-right: 15rpx;
position: relative;
display: inline-block;
vertical-align: middle;
}
.card .user_card .avabox .ava{
width: 100%;
height: 100%;
border-radius: 8rpx;
vertical-align: top
}
.card .user_card .avabox .vip{
position: absolute;
width: 32rpx;
height: 32rpx;
bottom:-5rpx;
right:-5rpx;
border-radius: 50%;
background: red;
}
.card .user_name {
width: auto;
overflow: hidden;
text-overflow: ellipsis;
white-space: nowrap;
display: inline-block;
font-size: 24rpx;
text-align: start;
display: inline-block;
vertical-align: middle;
font-weight: bold;
}
.card:nth-child(odd){
margin-right:32rpx;
}
.showpic{
width: 100%;
height: 100%;
border-radius: 8rpx;
overflow: hidden;
}
.scroll-end{
float: left;
height: 50rpx;
width: 100%;
color: #999;
line-height: 50rpx;
font-size: 28rpx;
text-align: center;
}
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4.效果
二、第三方包实现图片的懒加载
1.安装第三方包
1、开发者工具项目中，右键选择>在外部终端窗口打开
2、安装组件：npm install --save mina-lazy-image
3、勾选：使用npm模块
4、构建npm
微信开发者工具->工具->构建npm
5、在需要使用的文件，json配置文件中引入mina-lazy-image
2.组件引用
{
"usingComponents": {
"mina-lazy-image": "mina-lazy-image/index"
}
}
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3.wxml
<view class="page-section">
<text class="page-section__title">use mina-lazy-image</text>
<scroll-view class="cardbox">
<button
wx:if="{{item.live.play_urls}}"
class="card"
hover-class='none'
wx:for="{{content}}"
wx:key="*this"
bindtap="gotoLive"
data-url="{{item.live.play_urls.hdl.ORIGIN}}"
data-ava="{{item.live.user_info.avatar}}"
data-name="{{item.live.user_info.name}}"
data-audience="{{item.live.audience_num}}"
data-lid="{{item.live.id}}"
data-cacheprepic="{{item.live.pic}}"
data-prepic="{{item.live.pic_320}}"
data-share_desc="{{item.live.share_info.wechat_contact.cn.text}}"
style="position: relative;"
>
<view class="image_card">
<mina-lazy-image mode="aspectFill" src="{{item.live.pic_320}}" />
<view class="cover" />
<text class="audience">{{item.live.audience_num}}观众</text>
</view>
<view class="user_card" catchtap="gotoHome" data-uid="{{item.live.user_info.id}}">
<view class="avabox">
<mina-lazy-image src="{{item.live.user_info.avatar}}" data-uid="{{item.live.user_info.id}}" />
<image class="vip" wx:if="{{item.live.vip}}" lazy-load="{{true}}" src="http://img08.oneniceapp.com/upload/resource/9e7ca7ece11143b49fc952cfb2520e43.png" />
</view>
<text class="user_name">{{item.live.user_info.name}}</text>
</view>
</button>
<button
wx:if="{{item.live.playback_urls}}"
class="card"
open-type='getUserInfo'
bindtap="gotoPlayback"
wx:for="{{content}}"
data-url="{{item.live.playback_urls.hls.ORIGIN}}"
wx:key="*this"
>
<view class="image_card">
<mina-lazy-image mode="aspectFill" src="{{item.live.pic_320}}" />
<view class="cover" />
<text class="audience">{{item.live.audience_num}}观众</text>
<image class="back" lazy-load="{{true}}" src="http://img08.oneniceapp.com/upload/resource/002bdceaa732f300e33ab8b2cb84dd17.png" />
</view>
<view class="user_card">
<view class="avabox">
<mina-lazy-image src="{{item.live.user_info.avatar}}" />
<image class="vip" wx:if="{{item.live.vip}}" lazy-load="{{true}}" src="http://img08.oneniceapp.com/upload/resource/9e7ca7ece11143b49fc952cfb2520e43.png" />
</view>
<text class="user_name">{{item.live.user_info.name}}</text>
</view>
</button>
</scroll-view>
</view>
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4.js
const app = getApp()
Page({
/**
* 页面的初始数据
*/
data: {
},
onLoad: function () {
wx.request({
url: 'https://wxapi.kkgoo.cn/live/discover?type=hot',
method:'POST',
success:(res) => {
console.log(res)
this.setDis(res);
}
})
},
setDis(r) {
let newData = r.data.data;
this.data.nextKey = newData.nextkey ? newData.nextkey : this.data.nextKey;
this.setData({
content: newData.discover ? newData.discover : this.data.content,
banneritem: newData.cards ? newData.cards.slice(0, newData.cards.length - 1) : this.data.banneritem
})
},
previewImage(e){
console.log(e);
let url = e.currentTarget.dataset.url
wx.previewImage({
current:url,
urls: [url],
})
}
})
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5.css
.lazy-image{
}
/* 用户列表相关样式 */
.main{
font-size:0;
width:100%;
height: 100%;
font-family: 'PingFangSC-Semibold';
}
.title{
text-align:center;
font-size: 0;
}
.u_title{
display: inline-block;
width:100%;
font-size: 24rpx;
line-height: 24rpx;
margin:20rpx 0;
font-weight: bold;
}
.d_title{
display: inline-block;
width:100%;
line-height: 22rpx;
font-size: 22rpx;
}
.cardbox{
width: 100%;
font-size: 0;
box-sizing: border-box;
padding: 0 32rpx;
/*margin-top:60rpx;*/
display: inline-block;
}
button::after{
border: none
}
button{
width: auto !important;
padding-left: 0 !important;
padding-right: 0 !important;
background-color: #fff;
}
.card{
display: inline-block;
float:left;
/* margin-top:60rpx; */
}
.card .image_card{
width: 268rpx;
height: 268rpx;
border-radius: 8rpx;
position: relative;
}
.cover{
position: absolute;
/* width: 327rpx;
height: 327rpx; */
top: 0;
left: 0;
background-color: rgba(0,0,0,0.3);
z-index: 99;
border-radius: 8rpx;
}
.card .image_card .audience{
font-size: 22rpx;
color:#fff;
position: absolute;
left:16rpx;
top:16rpx;
z-index:999;
font-weight: bold;
}
.card .image_card .back{
position: absolute;
right:16rpx;
top:16rpx;
width: 56rpx;
height: 32rpx;
z-index: 999;
}
.card .user_card{
margin-top: 20rpx;
margin-bottom: 20rpx;
float:left;
margin-right: 15rpx;
}
.card .user_card .avabox{
width:48rpx;
height: 48rpx;
margin-right: 15rpx;
position: relative;
display: inline-block;
vertical-align: middle;
}
.card .user_card .avabox .ava{
width: 100%;
height: 100%;
border-radius: 8rpx;
vertical-align: top
}
.card .user_card .avabox .vip{
position: absolute;
width: 32rpx;
height: 32rpx;
bottom:-5rpx;
right:-5rpx;
border-radius: 50%;
background: red;
}
.card .user_name {
width: auto;
overflow: hidden;
text-overflow: ellipsis;
white-space: nowrap;
display: inline-block;
font-size: 24rpx;
text-align: start;
display: inline-block;
vertical-align: middle;
font-weight: bold;
}
.card:nth-child(odd){
margin-right:32rpx;
}
.showpic{
width: 100%;
height: 100%;
border-radius: 8rpx;
overflow: hidden;
}
.scroll-end{
float: left;
height: 50rpx;
width: 100%;
color: #999;
line-height: 50rpx;
font-size: 28rpx;
text-align: center;
}
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6.效果
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