一个手写的vue放大镜

组件使用less，请确保已安装loader
本组件为放大镜组件，传参列表为:

• width: 必传，设置放大镜的宽高(正方形)，放大区域等同，放大倍数为2倍

• piclist:必传，传入图片列表

  使用示例:

  script:

    import mirror from 'xx/mirror'
    export default {
      components:{
        mirror
      },
      data(){
        return {
          width:300,
          piclist:[
              xxxxxx,
              xxxxxx
          ],
        }
      }
    }

  html:

    <mirror :width="width"  :piclist="piclist" />    

详细代码:

html:

<template>
  <div class="mirror">
      <div class="wrap"  :style="{width:width+'px',height:width+'px'}" >
        <div ref="truth" :style="{width:'100%',height:'100%'}" @mousemove="move" @mouseenter="showmagnify" @mouseleave="hidemagnify">
        <div class="mask" ref="mask" v-show = "showmask" :style="{width:width/2+'px',height:width/2+'px',left:maskposition.x+'px',top:maskposition.y+'px'}"></div>
        <img :src="piclist[picindex]" draggable="false"/>
        </div>
        <div class="virtual" ref="virtual" v-if = "isshowvirtual" :style="{width:width+'px',height:width+'px'}" >
            <div class="big" ref = "bigpic" :style="{position:'absolute',width:2*width+'px',height:2*width+'px',backgroundsize:'100% 100%',backgroundimage:`url(${piclist[picindex]})`,left:percent.x, top:percent.y}" >
            </div>
        </div>

      </div>

      <ul class="piclist" :style="{width:width+'px'}">
          <li v-for = "(item,index) in piclist" :class="{now:index==picindex}" :data-index="index" :key ="item" @mouseenter="changeindex">
            <img :src ="item" />
          </li>
      </ul>
  </div>
</template>

js:

    export default {
      props:['width','piclist'],//宽度是用来给放大镜的
      data(){
        return {

          picindex:0,
          isshowvirtual:false,
          showmask:false,
          maskposition:{},
          percent:{},
        }
      },
      methods:{

        computedoffset(obj,prop){ //计算元素到body的绝对位置
        if(obj==document.body || obj.offsetparent == document.body){
          return parseint(obj[prop])
        }
        return parseint(obj[prop])+this.computedoffset(obj.offsetparent,prop)
    },
        changeindex(e){
          this.picindex = e.target.dataset.index
        },
        showmagnify(e){
          this.showmask=true;
          this.isshowvirtual = true;

        },
        hidemagnify(){
          this.isshowvirtual=false;
          this.showmask=false
        },


        computeposition(e){
            let x = e.pagex,y = e.pagey;
            let mask = this.$refs.mask;
            let truth = this.$refs.truth;
            let virtual = this.$refs.virtual;
            let bigpic = this.$refs.bigpic;
            x = x-this.computedoffset(truth,'offsetleft') -mask.offsetwidth/2;
            y = y-this.computedoffset(truth,'offsettop')- mask.offsetheight/2;

          if(x<=0) {
              x=0
            }else if(x>truth.offsetwidth - mask.offsetwidth){
              x = truth.offsetwidth/2
            }

            if(y<=0){
              y=0;
            }
            else if(y>truth.offsetheight - mask.offsetheight){
              y = truth.offsetheight/2
            }





            this.maskposition = {
              x,y
            }

            //计算比例

            this.percent={
              x:-x/(truth.offsetwidth-mask.offsetwidth)*(bigpic.offsetwidth - virtual.offsetwidth)+'px',
              y:-y/(truth.offsetheight-mask.offsetheight)*(bigpic.offsetheight - virtual.offsetheight)+'px'
            }
        },
        move(e){

          this.computeposition(e)

        }
    }
    }

css:

<style lang="less" scoped>
.now{
  border-color: cyan !important;

}
  .mirror{
    width:100%;
    .wrap{
      user-select: none;
      margin-bottom: 20px;
      position: relative;
      background-color: #fff;
      border:1px solid gray;
      box-sizing:border-box;
          cursor: pointer;

        img{
          width:100%;
          height:100%;
        }
        .virtual{
          overflow:hidden;

          width:100%;
          height:100%;
          position:absolute;
          left:calc(100% + 10px);
          top:0;
          background-repeat:no-repeat
        }
        .mask{
          position: absolute;
          background-image: url('https://img-tmdetail.alicdn.com/tps/i4/t12pdtxaldxxxxxxxx-2-2.png');
          background-repeat:repeat;
          cursor: move;
        }
    }

    .piclist{

      width:100%;
      display: flex;
      justify-content: space-between;
      flex-wrap:wrap;
      li{
        width:50px;
        height:50px;
        margin:5px;
        border:1px solid transparent;
        box-sizing: border-box;
        img{
          width:100%;
          height:100%
        }
      }
    }
    .piclist:after{
      content:"";
      flex:auto;
    }
  }
</style>

可直接复制文件内容至项目使用，文件地址：https://blog-static.cnblogs.com/files/hhyf/mirror.vue.js

效果