Vue实现网页放大镜效果

前端  /  管理员 发布于 6年前   268

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="http://www.fly63.com/article/detial/4590/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

来自：https://www.cnblogs.com/hhyf/archive/2019/08/09/11326389.html