90 lines
1.6 KiB
Vue
90 lines
1.6 KiB
Vue
<!--
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@name: LazyImage
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@author: kahu4
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@date: 2023-11-16 18:38
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@description：图片懒加载
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@update: 2023-11-16 18:38
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-->
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<script setup>
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import { getCurrentInstance, nextTick, onMounted, ref, toRefs } from "vue";
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import { lazyLoading } from "@/utils/images";
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/**
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* @property {string|number} 图片的唯一标识 必填(要求和lazy-${id})
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*/
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const props = defineProps({
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unique: {
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type: [String, Number],
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required: true
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},
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src: {
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type: String,
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required: true
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},
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mode: {
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type: String
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}
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})
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const {
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unique,
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src,
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mode
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} = toRefs(props)
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const showTruePic = ref(false); // 是否展示真是地址
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const _this = getCurrentInstance()
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function observerImage() {
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const intersectionObserver = uni.createIntersectionObserver(_this);
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intersectionObserver.relativeToViewport()
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intersectionObserver.observe(`.lazy-${ unique.value }`, (res) => {
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if (res.intersectionRatio <= 0) return
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showTruePic.value = true
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})
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}
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onMounted(() => {
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nextTick(observerImage);
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})
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</script>
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<template>
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<view :class="['lazy-image']">
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<view :class="[`lazy-${unique}`,'lazy-image__inner']">
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<image
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v-if="showTruePic"
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class="image-context"
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:src="src"
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:mode="mode"
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/>
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<image
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class="image-context"
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:src="lazyLoading"
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v-else
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/>
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</view>
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</view>
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</template>
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<style
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scoped
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lang="scss"
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>
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.lazy-image {
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// 微信小程序不设置这个会炸裂
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width: 100%;
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height: 100%;
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&__inner {
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width: 100%;
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height: 100%;
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.image-context {
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width: 100%;
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height: 100%;
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}
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}
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}
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</style>
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