本文小编为大家详细介绍“vue3怎么使用useMouseInElement实现图片局部放大预览效果”,内容详细,步骤清晰,细节处理妥当,希望这篇“vue3怎么使用useMouseInElement实现图片局部放大预览效果”文章能帮助大家解决疑惑,下面跟着小编的思路慢慢深入,一起来学习新知识吧。
1、首先要安装@vueuse/core
npm i @vueuse/core
2、实现过程如下:
<template> <div class="goods-image"> <!-- 大图 --> <div v-show="show" class="large" :></div> <!-- 中图 --> <div class="middle" ref="target"> <img :src="images[currIndex]" alt=""> <!-- 遮罩色块 --> <div v-show="show" class="layer" :></div> </div> <!-- 小图 --> <ul class="small"> <li v-for="(img,i) in images" :key="img" :class="{active:i===currIndex}"> <img @mouseenter="currIndex=i" :src="img" alt=""> </li> </ul> </div></template><script>import { reactive, ref, watch } from 'vue'import { useMouseInElement } from '@vueuse/core'export default { name: 'HelloWorld', props: { images: { type: Array, default: () => ['https://file.lsjlt.com/upload/202307/04/duq0tz5tv0a.jpg', 'https://file.lsjlt.com/upload/202307/04/tizgml3yma3.jpg', 'https://file.lsjlt.com/upload/202307/04/mxq5pqj0nfs.jpg', 'https://file.lsjlt.com/upload/202307/04/3xoxsnhn3gd.jpg', 'https://file.lsjlt.com/upload/202307/04/a1iqcfcnwpw.png',] } }, setup (props) { // 当前预览图的索引 const currIndex = ref(0) // 1. 是否显示遮罩和大图 const show = ref(false) // 2. 遮罩的坐标(样式) const layerPosition = reactive({ left: 0, top: 0 }) // 3. 大图背景定位(样式) const largePosition = reactive({ backgroundPositionX: 0, backgroundPositionY: 0 }) // 4. 使用useMouseInElement得到基于元素左上角的坐标和是否离开元素数据 const target = ref(null) const { elementX, elementY, isOutside } = useMouseInElement(target) watch([elementX, elementY, isOutside], () => { // 5. 根据得到数据设置样式数据和是否显示数据 show.value = !isOutside.value // 计算坐标 const position = { x: 0, y: 0 } if (elementX.value < 100) position.x = 0 else if (elementX.value > 300) position.x = 200 else position.x = elementX.value - 100 if (elementY.value < 100) position.y = 0 else if (elementY.value > 300) position.y = 200 else position.y = elementY.value - 100 // 给样式赋值 layerPosition.left = position.x + 'px' layerPosition.top = position.y + 'px' largePosition.backgroundPositionX = -2 * position.x + 'px' largePosition.backgroundPositionY = -2 * position.y + 'px' }) return { currIndex, show, layerPosition, largePosition, target } }}</script><style scoped lang="less">.goods-image { width: 480px; height: 400px; position: relative; display: flex; z-index: 500; .large { position: absolute; top: 0; left: 412px; width: 400px; height: 400px; box-shadow: 0 0 10px rgba(0,0,0,0.1); background-repeat: no-repeat; background-size: 800px 800px; background-color: #f8f8f8; } .middle { width: 400px; height: 400px; background: #f5f5f5; position: relative; cursor: move; img{ width: 100%; height: 100%; } //cursor: pointer; .layer { width: 200px; height: 200px; background: rgba(0,0,0,.2); left: 0; top: 0; position: absolute; } } .small { width: 80px; li { width: 68px; height: 68px; margin-left: 12px; margin-bottom: 15px; cursor: pointer; img{ width: 100%; height: 100%; } &:hover,&.active { border: 2px solid #27BA9B; } } }}</style>
3、使用:在其他的.vue文件中导入组件即可使用
例如:
import HelloWorld from "@/components/HelloWorld.vue";<HelloWorld ></HelloWorld>
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