项目需求：在表单中需要上传图片,上传成功的图片列表项需要拖拽排序，鼠标划过当前图片，显示更换/查看/删除功能，点击执行相对应的功能

实现效果：

一、安装 VueDraggable

# 使用 npm 安装
npm install vuedraggable --save

# 使用 yarn 安装
yarn add vuedraggable

二、使用

1. 引入并注册组件

import draggable from 'vuedraggable';

components: { draggable }

 2. 组件使用

<draggable 
  v-model="fileList" 
  class="flexBox" 
  :options="{ group: { name: 'file', pull: 'clone', put: false } }" 
  @end="draggableEnd">
</draggable>

三、el-upload 组件封装

<template>
  <div>
    <!-- 上传多张图片 新增更换查看删除功能 列表可拖拽 默认不验证上传大小 -->
    <el-upload 
      class="upload-demoDelete"
      ref="uploadRef"
      action="#"
      :headers="headers" 
      :disabled="disabled"
      :limit="limitNum"
      :show-file-list="false"
      :auto-upload="false"
      list-type="picture-card"
      :multiple="isMul"
      :on-change="onChangeUpload"
      :on-exceed="handleExceed"
      :file-list="fileList"
    >
    </el-upload>

    <!-- 上传列表 -->
    <draggable v-model="fileList" class="flexBox" @end="draggableEnd" :disabled="disabled" handle=".pacbox">
      <div v-for="(file, index) in fileList" :key="file.url" class="pacbox" @mouseenter="showActions = index" 
        :style="{ width: width + 'px', height: height + 'px' }" @mouseleave="showActions = -1">
        <img :src="file.url" alt="" :style="{ width: width + 'px', height: height + 'px' }" />
        <div v-if="showActions === index" class="button-container">
          <div class="flexBtn">
            <div class="button" @click="handleReplace(file, index)" v-if="!disabled">更换</div>
            <div @click.stop="handlePreview(file)" class="button marginLeft10-common">查看</div>
            <div @click.stop="handleRemove(file, index)" class="button marginLeft10-common" v-if="!disabled">删除</div>
          </div>
        </div>
      </div>
      <div class="uploads marginTop15-common" v-if="fileList.length < limit && !disabled"
        :style="{ width: width + 'px', height: height + 'px', lineHeight: height + 'px' }" @click="handleUpload">
        <i class="el-icon-plus pic-uploader-icon"></i>
      </div>
    </draggable>

    <!-- 查看弹窗 -->
    <el-dialog :close-on-click-modal="false" :visible.sync="dialogVisible" :append-to-body='true'>
      <div style="text-align: center;">
        <img :src="dialogImageUrl" alt="" style="width: 100%">
      </div>
    </el-dialog>
  </div>
</template>

<script>
import { getToken } from "@/utils/auth";
import draggable from 'vuedraggable';
import request from "@/utils/request"
export default {
  components: { draggable },
  data() {
    return {
      dialogImageUrl: '',
      dialogVisible: false,
      headers: {
        Authorization: "Bearer " + getToken(),
        token: getToken(),
      },
      fileList: [],
      onceWatch: false,
      showActions: -1, // 当前鼠标悬停显示的操作按钮
      ischange: false, // 是否更换
      changeIndex: null, // 当前选择图片index
      limitNum: 6, // 当前限制的数量
    };
  },
  props: {
    value: {
      default: "",
      type: String,
    },
    disabled: { // 查看页面--禁止上传不显示更换和删除
      default: false,
      type: Boolean,
    },
    limit: {
      type: Number,
      default: 6,
    },
    isMul: {
      default: false,
      type: Boolean,
    },
    islimitSize: {
      default: false,
      type: Boolean,
    },
    width: String,
    height: String,
  },

  methods: {
    //图片上传接口
    upImg(data) {
      data.append("dir", 'other')
      data.append("type", 0)
      return request({
        url: "/system/pc/ct/oss/upload",
        method: "post",
        data: data,
      })
    },
    // 文件超出个数限制
    handleExceed() {
      this.$message.warning(`最多可选择${this.limit}个`);
    },
    // 文件上传
    onChangeUpload(file, fileList) {
      const isJPEG = file.raw.type === "image/jpeg"
      const isJPG = file.raw.type === "image/jpg"
      const isPNG = file.raw.type === "image/png"
      const isLt6M = file.raw.size / 1024 / 1024 < 6
      if (!isJPEG && !isJPG && !isPNG) {
        return this.$message.error("请上传文件为图片格式!")
      }
      if (!isLt6M && this.islimitSize) {
        return this.$message.error("上传图片大小不能超过 6M!")
      }
      
      const loading = this.$loading({
        lock: true,
        text: "上传中",
        spinner: "el-icon-loading",
        background: "rgba(0, 0, 0, 0.7)",
      })
      const formData = new FormData()
      formData.append("file", file.raw)
      this.upImg(formData).then((response) => {
        if (this.changeIndex !== null && this.ischange) {
          // 替换对应索引的文件
          const newFile = {
            name: "",
            url: response.data.url
          };
          this.fileList.splice(this.changeIndex, 1, newFile);
          this.ischange = false
          this.changeIndex = null // 重置
        } else {
          this.fileList.push({
            name: "",
            url: response.data.url
          })
        }

        // 父组件传值
        let imageValue = [];
        this.fileList.forEach(el => {
          imageValue.push(el.url)
        })

        this.$emit("input", imageValue.join(","));
        loading.close();
      })
    },
    handleUploadError() {
      this.$message({
        type: "error",
        message: "上传失败",
      });
      this.loading.close();
    },
    // 初始化图片数据
    updateFileList() {
      if (this.value) {
        this.fileList = this.value.split(",").map((item, index) => {
          return {
            name: "",
            url: item
          }
        })
      }
    },
    // 拖拽结束
    draggableEnd() {
      this.$emit("input", this.fileList.map((item) => item.url).join(","))
    },
    // 更换图片
    handleReplace(file, index) {
      this.ischange = true
      this.changeIndex = index
      this.limitNum = this.limit+1
      if (this.$refs.uploadRef && this.$refs.uploadRef.$el) {
        this.$refs.uploadRef.$el.querySelector('input').click()
      }
    },
    // 查看图片
    handlePreview(file) {
      this.dialogImageUrl = file.url;
      this.dialogVisible = true;
      this.ischange = false
    },
    // 删除图片
    handleRemove(file, index) {
      this.fileList.splice(index, 1);
      this.$emit("input", this.fileList.map((item) => item.url).join(","));
      this.ischange = false
    },
    // 上传
    handleUpload() {
      this.limitNum = this.limit
      if (this.$refs.uploadRef && this.$refs.uploadRef.$el) {
        this.$refs.uploadRef.$el.querySelector('input').click()
      }
    }
  },
  mounted() {
    this.limitNum = this.limit // 初始化limit
  },
  watch: {
    value() {
      if (!this.onceWatch) {
        this.onceWatch = true
        this.updateFileList(); // 更新文件列表
      }
    }
  },
};
</script>

<style scoped lang="scss">
::v-deep .upload-demoDelete .el-upload--picture-card {
  display: none;
}

.flexBox {
  display: flex;
  flex-wrap: wrap;
}

.uploads {
  background-color: #F6FBFF;
  background-repeat: no-repeat;
  background-position: center center;
  border: 1px solid #C6EBFF;
  border-radius: 16px;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
}

.uploads .pic-uploader-icon {
  font-size: 20px;
  color: #fff;
  width: 36px;
  height: 36px;
  line-height: 36px;
  text-align: center;
  background-color: #8AD2FF;
  border-radius: 50%;
}

.pacbox img {
  border-radius: 17px;
}

.pacbox:hover .button-container {
  display: block;
}

.pacbox {
  position: relative;
  margin-right: 15px;
  margin-top: 10px;
  margin-bottom: 10px;
}

.button-container {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  background: rgba(0, 0, 0, 0.5);
  transition: opacity 0.3s;
  display: none;
  border-radius: 17px;
}

.flexBtn {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-top: 60px;
}

.button {
  text-decoration: underline;
  cursor: pointer;
  font-size: 14px;
  color: #007bff;
  white-space: nowrap;
  line-height: 20px;
}
</style>

四、组件使用

1.引入并注册组件

import UploadImageDelete from "@/components/UploadImageDelete";

components: { UploadImageDelete }

2.使用

<UploadImageDelete :limit='6' :isMul="true" :width="'148'" :height="'148'" :disabled="isLook" v-model="form.imgUrlsString" />

注意：

upImg 请求的接口 替换成自己的接口地址

使用了this.$emit("input"）要使用 v-model="form.imgUrlsString" 绑定变量