想用数据去驱动组件的渲染,此时就选择用了动态组件和实现
component有:is属性,它是控制要渲染那个组件,即当is的值为注册的值,即会把组件渲染进去,实现动态组件渲染
<component :is="component"></component>
<script>
import child from '@/componets/child'
export default {
componets:{
child
},
data(){
component: 'child'
}
}
</script>
import child from ‘@/componets/child’
但是 child 需要手动添加,
此时会有个问题:会加载不需要的组件出来,当一个组件过大,我们不需要把它加载出来,因为会影响到我们的性能
这样子不够优雅,那我们有没有办法加载不同的孙组件进来?有,即我们就要使用异步组件
在大型应用中,我们可能需要将应用分割成小一些的代码块,并且只在需要的时候才从服务器加载一个模块。为了简化,Vue 允许你以一个工厂函数的方式定义你的组件,这个工厂函数会异步解析你的组件定义。Vue 只有在这个组件需要被渲染的时候才会触发该工厂函数,且会把结果缓存起来供未来重渲染。
我们先写出动态组件出来
子组件
<template>
<div class="m-detail">
<component :is="item.component" v-for="(item, index) in detailArr" :key="index" :data="item.data"
v-bind="$attrs" v-on="$listeners">
</component>
</div>
</template>
<script>
import importComponent from '@/utils/importComponent'
export default {
title: 'store',
props: {
detailData: {
type: Array,
default() {
return []
}
}
},
data() {
return {}
},
computed: {
detailArr() {
const arr = []
for (var i = 0; i < this.detailData.length; i++) {
(i => {
const item = this.detailData[i]
var _type = this.detailData[i].type
const detailMap = {
BlockList: {
products:item.products
},
FloatList: {
products:item.products
}
}
const obj = {
component: importComponent(`components/Store/${_type}.vue`),
data: {
...detailMap[_type]
}
}
arr.push(obj)
})(i)
}
return arr
}
}
}
</script>
<style lang="less" scoped>
.m-detail {
min-height: 400px;
}
</style>
importComponent是一个把我们想要的组件动态出来:
export default (path, callback) => {
return resolve => require([`@/${path}`], Module => {
callback && callback(Module)
resolve(Module)
})
}
此时我们只需要在‘@/components/Store/’下面建立孙组件;
<template>
<view class="bank-card">
<view class="item text-center">
<text class="text-gray cuIcon-roundleftfill-copy roundleftfil" @click="hanldSwiper('left')"></text>
<text class="text-gray cuIcon-roundrightfill roundrightfill" @click="hanldSwiper('right')"></text>
<view class="item-title font-weight">图片</view>
<swiper class="swiper" :current="current">
<swiper-item v-for="(item,index) in data.products" :key="index">
<view class="swiper-item uni-bg-red" :style="`background-image: url(${item.productPic});`"></view>
</swiper-item>
</swiper>
<view>
<text class="spot">123</text>
<text class="spot">123</text>
<text class="spot">123</text>
</view>
<view class="bg-grey flex justify-between footer">
<view class="text-center">个人邀请</view>
<text class="line"></text>
<view @click="posterShare()">海报分享</view>
</view>
</view>
</view>
</template>
<script>
export default{
name: 'BankCard',
props: {
data: {
type: Object
}
},
data(){
return{
current:0
}
},
methods: {
hanldSwiper(item){
if(item == 'left' && this.current > 0){
this.current -= 1
return
}
if(item == 'right' && this.current < this.data.products.length-1){
this.current += 1
return
}
},
posterShare(){
this.$emit('toShare','val')
}
}
}
</script>
<style lang="less">
.bank-card{
.nav{
margin: 30upx 0;
.title{
font-weight: 700;
font-size: 32upx;
}
}
.item{
width: 100%;
height: 500upx;
border: 1px solid #CCCCCC;
display: inline-block;
margin-right: 30upx;
border-radius: 30upx;
padding: 30upx 0;
position: relative;
overflow: hidden;
.item-title{
margin-bottom: 30upx;
color:#000000
}
.roundleftfil{
position: absolute;
left:80upx;
top:180upx;
font-size: 50upx;
}
.roundrightfill{
position: absolute;
right:80upx;
top:180upx;
font-size: 50upx;
}
.footer{
width: 100%;
height: 60upx;
line-height: 60upx;
position: absolute;
bottom: 0;
>view {
width: 49%;
}
}
}
.spot{
margin:0 10upx;
vertical-align: center;
}
}
.swiper{
width: 340upx;
height: 240upx;
margin:auto;
border-radius: 30upx;
overflow: hidden;
.swiper-item{
width: 100%;
height: 100%;
background-size: cover;
background-repeat: round;
}
}
</style>
因为祖孙 组件的传值,如果使用this.&emit向父亲暴露,父亲再通过this.&emit向爷爷暴露是很麻烦的,因此我们使用
$attrs / $listeners(组件传值)来实现
此时我们就可以使用storeData来动态渲染组件了
<Store :detailData="storeData" @toShare='toShare'></Store>
this.storeData = [
{
type: 'BlockList',
products:[
{
newId:'13', productPic:'https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=229065980,2895464780&fm=26&gp=0.jpg'
},
{
newId:'14',
productPic:'https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=2350817201,1137116540&fm=26&gp=0.jpg'
},
{
newId:'15', productPic:'https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fimg.zcool.cn%2Fcommunity%2F031156f5aeb21a8a801207fa1bc9eac.jpg&refer=http%3A%2F%2Fimg.zcool.cn&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=jpeg?sec=1618385640&t=bc51aaaa2dc72dd8e565807935529732'
}
]
}
]