一、上传

<el-form-item label="上传图片">
                <el-upload
                  ref="upload"
                  action
                  :file-list="device.photo"
                  :limit="2"
                  list-type="picture"
                  :auto-upload="false"
                  :on-change="getFile"
                  :on-remove="removePhoto"
                >
                  <el-button size="small" type="primary" icon="el-icon-upload2">点击上传</el-button>
                  <span slot="tip" class="el-upload__tip">&nbsp;&nbsp;只能上传jpg/png文件，且不超过500KB</span>
                </el-upload>
              </el-form-item>

 js文件只粘贴了部分代码，因为后台要base64，所以有个图片转base64函数。

data() {
    return {
     
      device: new Device(),
      // 图片对象列表
      photos: [],
      // 图片base64列表
      photoBase64: []
    };
  },
  methods: {
   
    checkPhotoSize() {
      let that = this;
      let flag = true;
      for (let i = 0; i < that.photos.length; i++) {
        let size = Math.floor(that.photos[i].size / 1024);
        if (size > 500) {
          flag = false;
        }
      }
      return flag;
    },
    // 将file转base64
    getBase64(file) {
      return new Promise(function(resolve, reject) {
        let reader = new FileReader();
        let imgResult = "";
        reader.readAsDataURL(file);
        reader.onload = function() {
          imgResult = reader.result;
        };
        reader.onerror = function(error) {
          reject(error);
        };
        reader.onloadend = function() {
          resolve(imgResult);
        };
      });
    },

    getFile(file, fileList) {
      this.photos = fileList;
    },
    removePhoto(file, fileList) {
      this.photos = fileList;
    },

二、回显

<el-form-item label="上传图片">
                <el-upload
                  ref="upload"
                  action
                  :file-list="photoList"
                  :limit="2"
                  list-type="picture"
                  :auto-upload="false"
                  :on-change="getFile"
                  :on-remove="removePhoto"
                >
                  <el-button size="small" type="primary" icon="el-icon-upload2">点击上传</el-button>
                  <span slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500KB</span>
                </el-upload>
              </el-form-item>

回显的时候把后台传给你的base64编码数组放到file-list中即可，同时可以给这个图片命名。以下只粘贴部分js代码

class Photo {
  constructor(name, url) {
    this.name = name;
    this.url = url;
  }
}

export default {
  data() {
    return {
      // 照片回显用
      photoList: [],
      // 图片对象列表
      photos: [],
      // 图片base64列表
      photoBase64: []
    };
  },
  components: {
    Title,
    Header
  },
  mounted() {
    var device = this.$route.params.device;
    let photoList = [];
    for (var index = 0; index < device.photos.length; index++) {
      photoList.push(new Photo("图片" + (index + 1), device.photos[index]));
    }
    this.photoList = photoList;
  }
}

三、运行结果

上传：

回显（只是例子，没有用上面的图片）：