Vue+Element-ui<证件照上传，查看，回显>

效果图：

image.png

点击查看element-ui文档地址，此处使用的是 list-type="picture-card" 照片墙效果。
🍕想看详细代码的直接往下看~~~~

🎈上传样式处理：

通过标签包裹，每次上传时，实现只显示一个模块效果

.img_example{
    width: 150px;
    height: 150px;
    overflow: hidden;
}

image.png

🎈图片查看：

然后是查看示例图，通过使用 el-dialog 和自定义的样式属性，实现查看效果

<el-dialog :visible.sync="dialogVisible">
      <img width="100%" :src="dialogImageUrl" alt />
    </el-dialog>
<div class="img_example">
              <img src="@/assets/img/user_zhengmian.jpg" @click="toView_IMG" alt />
              <div class="cover">
                <div>
                  <i class="el-icon-zoom-in"></i>
                  <p>查看示例</p>
                </div>
              </div>
 </div>

注意：因为 cover 遮罩层是在图片上层，但是在查看图片时，必须要获取图片的相关参数 e,所以要在 cover 上添加一个css属性(禁用该标签上的所有鼠标事件)

.cover {
 pointer-events: none;
}

 //图片查看
    toView_IMG(e) {
      this.dialogImageUrl = e.toElement.src;
      this.dialogVisible = true;
    }

image.png

🎈图片回显：

大家可以参考element-ui的官方解释，主要是通过 :file-list，回显的时候需要注意格式:
name , url 都是必须要有的，name 尽量带文件类型(.jpg,.png等)，因为此处有对文件格式的校验

  PhotoFront: [{ name: "vue图片.png", url: "https://cn.vuejs.org/images/logo.png" }]

image.png

代码如下：

<template>
  <div>
    <el-dialog :visible.sync="dialogVisible" width="400px">
      <img width="100%" :src="dialogImageUrl" alt />
    </el-dialog>
    <div class="form_box">
      <el-form class="form">
        <el-form-item label="身份证照片：">
          <div class="img_upload_line">
            <div class="img_upload_box" @click.capture="fileType = 'fd_0'">
              <el-upload
                action="https://jsonplaceholder.typicode.com/posts/"
                list-type="picture-card"
                :auto-upload="false"
                :on-preview="handlePictureCardPreview"
                :on-remove="handleRemove"
                :on-change="selectFiles"
                title="个人信息页"
                :file-list="form.PhotoFront"
              >
                <i class="el-icon-plus"></i>
              </el-upload>
            </div>
            <div class="img_example">
              <img src="@/assets/img/user_zhengmian.jpg" @click="toView_IMG" alt />
              <div class="cover">
                <div>
                  <i class="el-icon-zoom-in"></i>
                  <p>查看示例</p>
                </div>
              </div>
            </div>
            <div class="img_upload_box" @click.capture="fileType = 'fd_1'">
              <el-upload
                action="https://jsonplaceholder.typicode.com/posts/"
                list-type="picture-card"
                :auto-upload="false"
                :on-preview="handlePictureCardPreview"
                :on-remove="handleRemove"
                :on-change="selectFiles"
                title="国徽页"
                :file-list="form.PhotoReverse"
              >
                <i class="el-icon-plus"></i>
              </el-upload>
            </div>
            <div class="img_example">
              <img src="@/assets/img/user_beimian.jpg" @click="toView_IMG" alt />
              <div class="cover">
                <div>
                  <i class="el-icon-zoom-in"></i>
                  <p>查看示例</p>
                </div>
              </div>
            </div>
          </div>
        </el-form-item>
      </el-form>
      <el-button type="primary" @click="submit()">点击上传</el-button>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //图片查看弹框和信息
      dialogVisible: false,
      dialogImageUrl: "",
      //每次点击上传时区分此时上传的文件类型
      // fd_0 正面
      // fd_1 反面
      fileType: "",
      form: {
        PhotoFront: [
          { name: "vue图片.png", url: "https://cn.vuejs.org/images/logo.png" }
        ],
        PhotoReverse: []
      }
    };
  },
  methods: {
    //选择文件方法
    selectFiles(file, fileList) {
      let _this = this;
      console.log(file, fileList);
      if (_this.fileType == "fd_0") {
        _this.form.PhotoFront = fileList;
      } else if (_this.fileType == "fd_1") {
        _this.form.PhotoReverse = fileList;
      }
    },
    //文件移除方法
    handleRemove(file, fileList) {
      let _this = this;
      console.log(file, fileList);
      if (_this.fileType == "fd_0") {
        _this.form.PhotoFront = [];
      } else if (_this.fileType == "fd_1") {
        _this.form.PhotoReverse = [];
      }
    },
    //上传格式校验
    handlePictureCardPreview(file) {
      if (!/\.(jpg|jpeg|png|JPG|PNG)$/.test(file.name)) {
        this.$message.warning("暂不支持查看该格式文件！");
        return false;
      } else {
        this.dialogImageUrl = file.url;
        this.dialogVisible = true;
      }
    },
    //图片查看
    toView_IMG(e) {
      this.dialogImageUrl = e.toElement.src;
      this.dialogVisible = true;
    },
    //点击上传
    submit() {
      if (!this.form.PhotoFront[0]) {
        this.$message.warning('请上传正面照')
        return
      }
      let formData = new FormData();
      if (this.form.PhotoFront[0].raw) {
        formData.append("PhotoFront", this.form.PhotoFront[0].raw);
      } else {
        formData.append("PhotoFront", this.form.PhotoFront[0].url);
      }
      console.log(formData)
      this.$message.success("上传成功");
    }
  }
};
</script>

<style lang="scss" scoped>
.form_box {
  padding-top: 10%;
  .form {
    width: 800px;
    margin: 20px auto;
  }
}
//图片上传
.img_upload_line {
  display: flex;
  .img_upload_box {
    width: 150px;
    height: 150px;
    overflow: hidden;
  }
  .img_example {
    display: flex;
    align-items: center;
    margin: 0 20px;
    cursor: pointer;
    //  width: 150px;
    width: 150px;
    height: 150px;
    overflow: hidden;
    position: relative;
    border-radius: 5px;
    &:hover .cover {
      opacity: 1;
    }
    &:hover img {
      filter: blur(3px);
    }
    img {
      width: 100%;
    }
    .cover {
      pointer-events: none;
      text-align: center;
      transition: 0.3s;
      opacity: 0;
      position: absolute;
      width: 100%;
      height: 100%;
      top: 0;
      left: 0;
      display: flex;
      justify-content: center;
      align-items: center;
      background: rgba(0, 0, 0, 0.534);
      i {
        color: white;
        font-size: 25px;
      }
      p {
        font-size: 13px;
        line-height: 20px;
        color: white;
      }
    }
  }
}
</style>