Vue 放大镜

 

  <div class="spec-preview">
    <!-- <span>{{skuImageList[0]}}</span> -->
    <img :src="imgobj.imgUrl" />
    <div class="event" @mousemove="handel"></div>
    <div class="big" >
      <img :src="imgobj.imgUrl" ref="big" />
    </div>
    <div class="mask" ref="mask"></div>
  </div>

 

<script>
  export default {
    name: "Zoom",
    data() {
      return {
        arrtIndex:0
      }
    },
    props:['skuImageList'],
    computed: {
      imgobj(){
        return this.skuImageList[this.arrtIndex] || {}
      }
    },
    mounted() {
      this.$bus.$on('nextchang',(index)=>{
        // console.log(index);
        this.arrtIndex = index
      })
    },
    methods: {
      handel(event){
        let mask = this.$refs.mask;
        let big = this.$refs.big;
        let left = event.offsetX - mask.offsetWidth/2;
        let top = event.offsetY - mask.offsetHeight/2;
        // console.log(left,top);
        if(left < 0) left = 0
        if(top < 0) top = 0
        if(left > mask.offsetWidth) left = mask.offsetWidth  
        if(top > mask.offsetHeight) top = mask.offsetHeight  
        mask.style.left = left + 'px'
        mask.style.top = top+ 'px'

        big.style.top = -2 * top+ 'px'
        big.style.left = -2 * left + 'px'
      }
    },
  }
</script>

 

  .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;
    }
  }