vue 详情页产品轮播,图片放大镜效果

 

<template>
  <div class="spec-preview">
    <img :src="skuImageList[imgIndex].imgUrl" />
    <div @mousemove="mouseMove" class="event"></div>
    <div class="big">
      <img ref="big" :src="skuImageList[imgIndex].imgUrl" />
    </div>
    <div class="mask" ref="mask"></div>
  </div>
</template>

<script>
	
  export default {
    name: "Zoom",
	data() {
		return {
			imgIndex: 0
		}
	},
	methods:{
		mouseMove(event){
			//获取蒙版div
			let mask = this.$refs.mask
			//放大镜图片div
			let big = this.$refs.big
			//获取蒙版的左边位置和顶部位置
			let left =  event.offsetX - mask.offsetWidth/2
			let top  =  event.offsetY - mask.offsetHeight/2
			
			//左边小于0 那么left就等于0
			if(left < 0){
				left = 0
			}
			//左边大于mask蒙版的宽度 那左边的位置就是当前蒙版的宽 蒙版是大div的1/2
			if(left > mask.offsetWidth){
				left = mask.offsetWidth
			}
			if(top < 0){
				top = 0
			}
			if(top > mask.offsetHeight){
				top = mask.offsetHeight
			}
			
			//蒙版移动
			mask.style.left = left+'px';
			mask.style.top = top+'px';
			//放大镜图 移动
			big.style.left = -left*2+'px'
			big.style.top = -top*2+'px'
		}
	},
	mounted() {
		//接收兄弟的事件 参数
		this.$bus.$on('imgIndex',(imgIndex)=>{
			this.imgIndex = imgIndex
		})
	},
	props:["skuImageList"]
  }
</script>

<style lang="less">
  .spec-preview {
    position: relative;
    width: 400px;
    height: 400px;
    border: 1px solid #ccc;

    img {
      width: 100%;
      height: 100%;
    }

    .event {
      width: 100%;
      height: 100%;
      position: absolute;
      top: 0;
      left: 0;
      z-index: 998;
    }

    .mask {
      width: 50%;
      height: 50%;
      background-color: rgba(0, 255, 0, 0.3);
      position: absolute;
      left: 0;
      top: 0;
      display: none;
    }

    .big {
      width: 100%;
      height: 100%;
      position: absolute;
      top: -1px;
      left: 100%;
      border: 1px solid #aaa;
      overflow: hidden;
      z-index: 998;
      display: none;
      background: white;

      img {
        width: 200%;
        max-width: 200%;
        height: 200%;
        position: absolute;
        left: 0;
        top: 0;
      }
    }

    .event:hover~.mask,
    .event:hover~.big {
      display: block;
    }
  }
</style>