html部分 注册方法

<!-- 新增点击富文本图片放大功能 -->
<div class="wendang" v-html="content" @click="showImg($event)"></div>

放大展示区dialog

<!-- 富文本图片放大 -->
    <div class="imgDolg" v-show="imgPreview.show" @click.stop="imgPreview.show = false">
      <i class="el-icon-close" id="imgDolgClose" @click.stop="imgPreview.show = false"></i>
      <img @click.stop="imgPreview.show = true" :src="imgPreview.img" />
    </div>

data{ return { } }

imgPreview:{
  img:"",
  show:false
}

methods

// 图片点击放大
    showImg(e) {
      // console.log(e.target)
      if (e.target.tagName == 'IMG') {
        this.imgPreview.img = e.target.src
        this.imgPreview.show = true
      }
    },

css

//富文本图片放大
.imgDolg {
  width: 100vw;
  height: 100vh;
  position: fixed;
  z-index: 9999;
  background-color: rgba(140, 134, 134, 0.6);
  top: 0;
  left: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  #imgDolgClose {
    position: fixed;
    top: 35px;
    cursor: pointer;
    right: 7%;
    font-size: 50px;
    color: white;
  }
  img{
    width: 80%;
  }
}