开始展示

<el-upload
     class="avatar-uploader"
      action="上传后端地址"
      :show-file-list="false"
      :auto-upload="true"
      :on-success="handleAvatarSuccess"
      :before-upload="beforeAvatarUpload"
>
  <i
          v-if="imageUrl"
          class="el-icon-delete deleteImg"
          @click.stop="handleRemove"
  ></i>
  <img v-if="imageUrl" :src="imageUrl" class="avatar" />
  <i v-else class="el-icon-plus avatar-uploader-icon"></i>
</el-upload>

上传完成后的处理后端返回,beforeAvatarUpload是上传前验证图片大小

handleAvatarSuccess(res, file) {
                console.log(res)
                if (res.code === 200){
                    this.imageUrl = res.url;
                }else{
                    this.$message.error('上传图片失败')
                }
            },
beforeAvatarUpload(file) {
	const isLt2M = file.size / 1024 / 1024 < 2;
	if (!isLt2M) {
	   this.$message.error('上传头像图片大小不能超过 2MB!');
	}
	return isLt2M;
},
handleRemove(file, fileList) {
     this.imageUrl = "";
},