前言

起因：关于聊天框图片点击查看的实现，不如记下，以后好复用

手写实现

  1. 在父组件引入并且传值
// 父组件
<preview :previewImg="companyPreview"></preview>
// 引入
import preview from "./preview.vue"
// components中注册
components:{preview},
// 传递的参数
companyPreview:{
 imgList: [], // 所有图片数组
    index: 0, // 当前点击的图片的索引
    infinite: false,  // 是否可以循环切换
    popup: false // 弹窗的显示隐藏
},
// 图片添加点击事件
```js
// 查看图片
lookPhoto(img){
     this.companyPreview.imgList[0]=img
     this.companyPreview.popup=true
 },
  1. 子组件中封装操作方法

// 预览组件
<template>
  <div v-if="previewImg.popup" class="rlPopup">
    <div class="close-big-img" @click="close()">
      <em class="font_family icon-close-circle"></em>
    </div>
    <div class="prev handle-btn" v-if="!isSingle" @click="prev()">
      <em class="font_family icon-left-line"></em>
    </div>
    <div class="next handle-btn" v-if="!isSingle" @click="next()">
      <em class="font_family icon-right--line"></em>
    </div>
    <!--放大缩小旋转-->
    <div class="zoom-wrap">
      <i @click="handleActions('zoomOut')" class="el-icon-zoom-out"></i>
      <i @click="handleActions('zoomIn')" class="el-icon-zoom-in"></i>
      <i @click="handleActions('left')" class="el-icon-refresh-left"></i>
      <i @click="handleActions('right')" class="el-icon-refresh-right"></i>
    </div>
    <div class="img-list-wrap">
      <div v-for="(img, i) in previewImg.imgList" :key="img">
        <img
          ref="img"
          :src="img"
          v-if="i === previewImg.index"
          :style="imgStyle"
          alt="">
      </div>
    </div>
  </div>
</template>

<script>
export default {
  name: 'PreviewImage',
  props: {
    previewImg: {
      type: Object,
      default: () => {}
    }
  },
  data() {
    return {
      transform: {
        scale: 1,
        degree: 0
      }
    }
  },
  computed: { // 计算属性动态响应数据
    isSingle() { // 单图片无向左向右
      return this.previewImg.imgList.length <= 1
    },
    isFirst() {
      return this.previewImg.index === 0
    },
    isLast() {
      return this.previewImg.index === this.previewImg.imgList.length - 1
    },
    imgStyle() {
      const { scale, degree } = this.transform
      const style = {
        transform: `scale(${scale}) rotate(${degree}deg)`
      }
      return style
    }
  },
  methods: {
    prev() { // 点击切换上一张
      if (this.isFirst && !this.previewImg.infinite) return
      if (this.$parent.companyPreview.index > 0) {
        const len = this.previewImg.imgList.length
        this.$parent.companyPreview.index = (this.$parent.companyPreview.index - 1 + len) % len
        this.reset()
      }
    },
    next() { // 点击切换下一张
      if (this.isLast && !this.previewImg.infinite) return
      if (this.previewImg.imgList.length > this.$parent.companyPreview.index) {
        const len = this.previewImg.imgList.length
        this.$parent.companyPreview.index = (this.$parent.companyPreview.index + 1) % len
        this.reset()
      }
    },
    handleActions(action) { // 放大旋转等操作
      const { zoomRate, rotateDeg, enableTransition } = {
        zoomRate: 0.2,
        rotateDeg: 90,
        enableTransition: true
      }
      const { transform } = this
      switch (action) {
        case 'zoomOut':
          if (transform.scale > 0.2) {
            transform.scale = parseFloat((transform.scale - zoomRate).toFixed(3))
          }
          break
        case 'zoomIn':
          transform.scale = parseFloat((transform.scale + zoomRate).toFixed(3))
          break
        case 'left':
          transform.degree -= rotateDeg
          break
        case 'right':
          transform.degree += rotateDeg
          break
      }
      transform.enableTransition = enableTransition
    },
    reset() { // 初始化图片样式
      this.transform = {
        scale: 1,
        degree: 0
      }
    },
    close() { // 父组件隐藏
      this.$parent.companyPreview.popup = false
    }
  }
}
</script>

<style lang="less" scoped>
  // 查看大图
  .rlPopup { // 全屏遮罩显示
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
    .close-big-img {
      position: absolute;
      top: 20px;
      right: 5%;
      z-index: 10000;

      em {
        cursor: pointer;
        color: #ffffff;
        font-size: 36px;
      }
    }

    .handle-btn {
      position: absolute;
      top: 50%;
      transform: translateY(-50%);
      width: 44px;
      height: 44px;
      line-height: 38px;
      font-size: 24px;
      color: #fff;
      background-color: #606266;
      border-color: #fff;
      border-radius: 50%;
      cursor: pointer;
      text-align: center;
      z-index: 10000;
    }

    .prev {
      left: 40px;
    }

    .next {
      right: 40px;
    }

    .img-list-wrap {
      width: 100%;
      height: 100%;
      display: flex;
      justify-content: center;
      align-items: center;

      img {
        display: block;
        object-fit: scale-down;
        transition: all 0.3s;
        width: 480px;
        height: 320px;
      }
    }

    .zoom-wrap {
      position: absolute;
      bottom: 16px;
      left: 50%;
      transform: translateX(-50%);
      background-color: #606266;
      border-radius: 22px;
      z-index: 10000;
      width: 222px;
      height: 44px;
      line-height: 47px;
      padding: 0 23px;

      i {
        color: #ffffff;
        cursor: pointer;
        font-size: 22px;
        margin-right: 25px;

        &:last-child {
          margin-right: 0;
        }
      }
    }
  }
</style>


注意事项
以上所有的em标签无法显示，需要自己改为自己项目里面的图标库所需的按钮
  1. 携带缩略图
<template>
  <div v-if="previewImg.popup" class="rlPopup">
    <div class="close-big-img" @click="close()">
      <em class="font_family icon-close-circle"></em>
    </div>
    <div class="prev handle-btn" v-if="!isSingle" @click="prev()">
      <em class="font_family icon-left-line"></em>
    </div>
    <div class="next handle-btn" v-if="!isSingle" @click="next()">
      <em class="font_family icon-right--line"></em>
    </div>
    <!--缩略图-->
    <div class="thumb-wrap">
      <ul>
        <li
          v-for="(img, index) in previewImg.imgList"
          :key="img"
          :class="{ active:previewImg.index === index}"
          @click="showCurrent(index)">
          <img :src="img">
        </li>
      </ul>
    </div>
    <div class="img-list-wrap">
      <div v-for="(img, i) in previewImg.imgList" :key="img">
        <img
          ref="img"
          :src="img"
          v-if="i === previewImg.index"
          :style="imgStyle">
      </div>
    </div>
  </div>
</template>

<script>
export default {
  name: 'PreviewImage',
  props: {
    previewImg: {
      type: Object,
      default: () => {}
    }
  },
  data() {
    return {
      transform: {
        scale: 1,
        degree: 0
      }
    }
  },
  computed: {
    isSingle() {
      return this.previewImg.imgList.length <= 1
    },
    isFirst() {
      return this.previewImg.index === 0
    },
    isLast() {
      return this.previewImg.index === this.previewImg.imgList.length - 1
    },
    imgStyle() {
      const { scale, degree } = this.transform
      const style = {
        transform: `scale(${scale}) rotate(${degree}deg)`
      }
      return style
    }
  },
  methods: {
    prev() {
      if (this.isFirst && !this.previewImg.infinite) return
      if (this.$parent.companyPreview.index >= 0) {
        const len = this.previewImg.imgList.length
        this.$parent.companyPreview.index = (this.$parent.companyPreview.index - 1 + len) % len
        this.reset()
      }
    },
    next() {
      if (this.isLast && !this.previewImg.infinite) return
      if (this.previewImg.imgList.length > this.$parent.companyPreview.index) {
        const len = this.previewImg.imgList.length
        this.$parent.companyPreview.index = (this.$parent.companyPreview.index + 1) % len
        this.reset()
      }
    },
    reset() {
      this.transform = {
        scale: 1,
        degree: 0
      }
    },
    showCurrent(index) {
      this.previewImg.index = index
    },
    close() {
      this.$parent.companyPreview.popup = false
    }
  }
}
</script>

<style lang="less" scoped>
  // 查看大图
  .rlPopup {
    background: rgba(0,0,0,0.7);
    .close-big-img {
      position: absolute;
      top: 20px;
      right: 2%;
      z-index: 1000;

      em {
        cursor: pointer;
        color: #ffffff;
        font-size: 36px;
      }
    }

    .handle-btn {
      position: absolute;
      top: 50%;
      transform: translateY(-50%);
      width: 66px;
      height: 66px;
      line-height: 63px;
      color: #fff;
      background-color: rgba(0, 0, 0, 0.6);
      border-radius: 4px;
      cursor: pointer;
      text-align: center;
      z-index: 10000;
      em {
        font-size: 50px;
      }
    }

    .prev {
      left: 5%;
    }

    .next {
      right: 5%;
    }

    .img-list-wrap {
      width: 100%;
      height: 100%;
      display: flex;
      justify-content: center;
      align-items: center;

      img {
        display: block;
        object-fit: scale-down;
        transition: all 0.3s;
        max-width: 800px;
        max-height: 600px;
      }
    }

    .thumb-wrap {
      position: absolute;
      bottom: 2%;
      left: 50%;
      transform: translateX(-50%);

      li {
        float: left;
        width: 60px;
        height: 45px;
        border: solid 1px #ececec;
        position: relative;
        margin-right: 5px;
        cursor: pointer;

        &:last-child {
          margin-right: 0;
        }

        img {
          max-width: 57px;
          max-height: 42px;
          display: block;
          object-fit: scale-down;
          position: absolute;
          top: 50%;
          left: 50%;
          transform: translate(-50%, -50%);
        }
      }

      .active {
        border-color: #e5242b;
      }
    }
  }
</style>

使用vue-preview实现

  1. 引入组件
npm i vue-preview -S
  1. 项目全局引入
import VuePreview from 'vue-preview'
Vue.use(VuePreview)
  1. 组件使用
<vue-preview :slides="listurl"></vue-preview>
// 数据
listurl:[
    {
         w:600,
         h:400,
         src:'https://dss2.bdstatic.com/8_V1bjqh_Q23odCf/pacific/1989771219.jpg',
         msrc:'https://dss2.bdstatic.com/8_V1bjqh_Q23odCf/pacific/1989771219.jpg',
     },
     {
         w:600,
         h:400,
         src:'https://dss2.bdstatic.com/8_V1bjqh_Q23odCf/pacific/1981772440.jpg',
         msrc:'https://dss2.bdstatic.com/8_V1bjqh_Q23odCf/pacific/1981772440.jpg',
     },
     // w是预览时的大图的图片宽度，h属性是预览时的大图的图片高度。src是预览时大图的url，msrc属性是小图的url。
 ],
// css  // 一行显示
<style lang="scss" scoped>
::v-deep .my-gallery{   //deep深层作用选择器
       display: flex;
       flex-wrap:wrap;//默认换行
       figure{
           width: 30%;  
           margin: 5px; 
           img{
               width: 100%;
               box-shadow: 0 0 8px #999;  
               border-radius: 5px;
           }
       }
   }
   </style>

在这里插入图片描述
在这里插入图片描述
3. 如果不想要某个按钮。比如分享按钮，可以使用css样式控制

::v-deep .pswp__top-bar .pswp__button--share{
           display: none !important;
       }
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