vue图片放大镜效果

原作者地址：https://github.com/lemontree2000/vue-magnify

经测试，原插件在使用时有bug,即在预览时进行鼠标滚动，导致遮罩层计算错误。我已修复该bug,特分享出来。

组件核心代码：

<template>

  <div class="magnify">

    <div class="preview-box" @mousemove="move($event)"  @mouseout="out" ref="previewBox">

      <img width="100%" :src="previewImg" alt="">

      <div class="hover-box" ref="hoverBox"></div>

    </div>

    <div class="zoom-box" v-show="zoomVisiable" ref="zoomBox">

      <img :src="zoomImg" alt="" ref="bigImg">

    </div>

  </div>

</template>

<script>

function offset(el) {

  let top = el.offsetTop;

  let left = el.offsetLeft;

  while (el.offsetParent) {

    el = el.offsetParent;

    top += el.offsetTop;

    left += el.offsetLeft;

  }

  return {

    left: left,

    top: top

  }

}

export default {

  name: 'magnify',

  props: {

    previewImg: {

      type: String,

      default: ''

    },

    zoomImg: {

      type: String,

      default: ''

    }

  },

  data() {

    return {

      zoomVisiable: false,

      hoverVisiable: false

    };

  },

  methods: {

    out() {

      this.zoomVisiable = false;

    },

    move(ev) {

      this.init();

      // 鼠标距离屏幕距离

      let moveX = ev.clientX;

      let moveY = ev.clientY;

      // 大盒子距离顶部的距离

      let offsetLeft = offset(this.oPreviewBox).left;

      let offsetTop = offset(this.oPreviewBox).top;

      let left = moveX - offsetLeft - this.houverWidth / 2;

      let top

      if(this.scroll > 0) {

        top = moveY - offsetTop + this.scroll - this.houverHeight / 2;

      }else {

        top = moveY - offsetTop - this.houverHeight / 2;

      }

      let maxWidth = this.pWidth - this.houverWidth;

      let maxHeight = this.pWidth - this.houverHeight;

      left = left < 0 ? 0 : left > maxWidth ? maxWidth : left;

      top = top < 0 ? 0 : top > maxHeight ? maxHeight : top;

      let percentX = left / (maxWidth);

      let percentY = top / (maxHeight);

      this.oHoverBox.style.left = left + 'px';

      this.oHoverBox.style.top = top  + 'px';

      this.oBigImg.style.left = percentX * (this.bWidth - this.imgWidth) + 'px';

      this.oBigImg.style.top = percentY * (this.bHeight - this.imgHeight) + 'px';

      this.$emit('move', ev);

      this.zoomVisiable = true;

    },

    init() {

      this.oHoverBox = this.$refs.hoverBox;

      this.oPreviewBox = this.$refs.previewBox;

      this.oBigImg = this.$refs.bigImg;

      this.imgBox = this.$refs.zoomBox;

      this.houverWidth = this.oHoverBox.offsetWidth;

      this.houverHeight = this.oHoverBox.offsetHeight;

      this.pWidth = this.oPreviewBox.offsetWidth;

      this.pHeight = this.oPreviewBox.offsetHeight;

      this.imgWidth = this.oBigImg.offsetWidth;

      this.imgHeight = this.oBigImg.offsetHeight;

      this.bWidth = this.imgBox.offsetWidth;

      this.bHeight = this.imgBox.offsetHeight;

      this.scroll = document.documentElement.scrollTop || document.body.scrollTop;

    }

  }

};

</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->

<style lang="scss" scoped>

  .magnify {

    position: relative;

    .preview-box {

      width: 480px;

      height: 480px;

      border: 1px solid #dededd;

      position: relative;

      &:hover .hover-box{

        display: block;

      }

      .hover-box {

        position: absolute;

        display: none;

        left: 0;

        top: 0;

        width: 100px;

        height: 100px;

        border: 1px solid #545454;

        background: url('https://img-tmdetail.alicdn.com/tps/i4/T12pdtXaldXXXXXXXX-2-2.png') repeat 0 0;

        cursor: move;

        user-select: none;

      }

    }

    .zoom-box {

      width: 480px;

      height: 480px;

      overflow: hidden;

      position: absolute;

      left: 485px;

      border: 1px solid #dc7a7a;;

      top: 0;

      img {

        position: absolute;

        top: 0;

        left: 0;

      }

    }

  }

</style>

使用：

<template>

<div>

<my-magnify :previewImg="data.min" :zoomImg="data.max"></my-magnify>

</div>

</template>

<script>

import MyMagnify from "~/components/Magnify.vue";

export default {

  data() {

    return {

      data: {

        min:

          "https://img.alicdn.com/imgextra/i3/2857774462/TB21fgcwwNlpuFjy0FfXXX3CpXa_!!2857774462.jpg_430x430q90.jpg",

        max:

          "https://img.alicdn.com/imgextra/i3/2857774462/TB21fgcwwNlpuFjy0FfXXX3CpXa_!!2857774462.jpg"

      }

    };

  },

  components: {

    MyMagnify

  }

}

</script>

效果图：

巴特西

vue图片放大镜效果

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