Vue3+vueuse实现放大镜示例详解

yarn add @Vueuse/core或
npm i @vueuse/core或

<script lang="ts" setup">
import { ref } from 'vue';
const target = ref(null)
const images = ref('https://images.mepai.me/app/works/178221/2022-07-14/w_62d01aa163e45/062d01aa163f41.jpg!1200w.jpg')
const active = ref(0)
</script>
<template>
  <div class="Goods-image">
    <!-- 显示在右侧的放大之后的区域 -->
    <div class="large"
         v-show="true"
    :style="[{backgroundImage:'url('+images+')'}]"></div>
    <div class="middle" ref="target">
      <img :src="images" alt=""  />
      <!-- 移动遮罩 -->
      <div class="layer" ref="target" v-show="true "></div>
    </div>
  </div>
</template>
<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;
    // 放大一倍
    background-size: 800px 800px;
    background-color: #f8f8f8;
  }
  .middle {
    width: 400px;
    height: 400px;
    background: #f5f5f5;
    position: relative;
    cursor: move;
    img{
      width: 400px;
      height: 400px;
    }
    .layer {
      width: 200px;
      height: 200px;
      background: rgba(0,0,0,.2);
      left: 0;
      top: 0;
      // 可以移动
      position: absolute;
    }
  }
  .small {
    width: 80px;
    li {
      width: 68px;
      height: 68px;
      margin-left: 12px;
      margin-bottom: 15px;
      cursor: pointer;
      &:hover,
      &.active {
        border: 2px solid red;
      }
    }
  }
}
</style>

<script lang="ts" setup name="GoodsImage">import { ref } from 'vue';
import {useMouseInElement} from '@vueuse/core'
const target = ref(null)
// isOutside是否进入指定区域 进入为false 否则为true
// elementX 鼠标X位置
// elementY 鼠标Y位置
const {isOutside,elementX,elementY} = useMouseInElement(target) // useMouseInElement(指定的区域)鼠标进入的位置
const images = ref('Https://images.mepai.me/app/works/178221/2022-07-14/w_62d01aa163e45/062d01aa163f41.jpg!1200w.jpg')
</script>
<template>
    {{isOutside}}
   X: {{elementX}}
   Y: {{elementY}}
  <div class="goods-image">
    <!-- 显示在右侧的放大之后的区域 -->
    <div class="large"
         v-show="!isOutside"
    :style="[{backgroundImage:'url('+images+')'}]"></div>
    <div class="middle" ref="target">
      <img :src="images" alt="" />
      <!-- 移动遮罩 -->
      <div class="layer" ref="target" v-show="!isOutside "></div>
    </div>
  </div>
</template>

import {useMouseInElement} from '@vueuse/core'
import { computed } from '@vue/Reactivity';
const {isOutside,elementX,elementY} = useMouseInElement(target)
const position = computed(()=>{
  let x = elementX.value -100 // -100 让光标处再中间
  let y = elementY.value -100
   // 边界处理
  x = x<0 ? 0 : x
  y = y<0 ? 0 : y
  x = x>200 ? 200 : x
  y = y>200 ? 200 : y
  return {
    x,
    y 
  }
})
 <!-- 移动遮罩 -->
<div class="layer" ref="target" v-show="!isOutside " 
:style="{ left:position.x+'px', top: position.y+'px' }"></div>

 <!-- 显示在右侧的放大之后的区域 -->
    <div class="large"
     v-show="!isOutside"
    :style="[{backgroundImage:'url('+images+')', backgroundPosition: `-${position.x*2}px -${position.y*2}px`}]"></div>

<script lang="ts" setup name="GoodsImage">import { ref } from 'vue';
import {useMouseInElement} from '@vueuse/core'
import { computed } from '@vue/reactivity';
const target = ref(null)
// isOutside是否进入指定区域 进入为false 否则为true
// elementX 鼠标X位置
// elementY 鼠标Y位置
const {isOutside,elementX,elementY} = useMouseInElement(target) // useMouseInElement(指定的区域)鼠标进入的位置
const active = ref(0)
const images = ref('https://images.mepai.me/app/works/178221/2022-07-14/w_62d01aa163e45/062d01aa163f41.jpg!1200w.jpg')
const position = computed(()=>{
  let x = elementX.value -100
  let y = elementY.value -100
  x = x<0 ? 0 : x
  y = y<0 ? 0 : y
  x = x>200 ? 200 : x
  y = y>200 ? 200 : y
  return {
    x,
    y 
  }
})
</script>
<template>
    <!-- {{isOutside}}
   X: {{elementX}}
   Y: {{elementY}} -->
  <div class="goods-image">
    <!-- 显示在右侧的放大之后的区域 -->
    <div class="large"
         v-show="!isOutside"
    :style="[{backgroundImage:'url('+images+')', backgroundPosition: `-${position.x*2}px -${position.y*2}px`}]"></div>
    <div class="middle" ref="target">
      <img :src="images" alt="" />
      <!-- 移动遮罩 -->
      <div class="layer" ref="target" v-show="!isOutside " :style="{ left:position.x+'px', top: position.y+'px' }"></div>
    </div>
  </div>
</template>
<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;
    // 放大一倍
    background-size: 800px 800px;
    background-color: #f8f8f8;
  }
  .middle {
    width: 400px;
    height: 400px;
    background: #f5f5f5;
    position: relative;
    cursor: move;
    img{
      width: 400px;
      height: 400px;
    }
    .layer {
      width: 200px;
      height: 200px;
      background: rgba(0,0,0,.2);
      left: 0;
      top: 0;
      // 可以移动
      position: absolute;
    }
  }
  .small {
    width: 80px;
    li {
      width: 68px;
      height: 68px;
      margin-left: 12px;
      margin-bottom: 15px;
      cursor: pointer;
      &:hover,
      &.active {
        border: 2px solid red;
      }
    }
  }
}
</style>