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" :style="[{backgroundImage:`url(${images[currIndex]})`},largePosition]"></div><!-- 中图 --><div class="middle" ref="target"><img :src="images[currIndex]" alt=""><!-- 遮罩色块 --><div v-show="show" class="layer" :style="layerPosition"></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://yanxuan-item.nosdn.127.net/a6939f41c48fa9e9c8f7a7ed855351f1.jpg','https://yanxuan-item.nosdn.127.net/0cdfd546f8675669b87716114ad5900a.jpg','https://yanxuan-item.nosdn.127.net/240983ccc935146a4795e3990d30468d.jpg','https://yanxuan-item.nosdn.127.net/d46e005025a5d3b73c4781d31b327558.jpg','https://yanxuan-item.nosdn.127.net/330913911087b44b0d817dd78233165f.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 = 0else if (elementX.value > 300) position.x = 200else position.x = elementX.value - 100if (elementY.value < 100) position.y = 0else if (elementY.value > 300) position.y = 200else 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>

4、效果如下：

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