一个手写的vue放大镜效果

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

以上所述是小编给大家介绍的一个手写的vue放大镜效果,希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对网站的支持！
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