有没有小伙伴在使用ant-design-vue的upload组件时，发现api文档在图片预览功能的介绍寥寥无几，而且也没提供视频预览的demo，在实际开发中碰到相应的需求直挠头~~~~，别急，下面来给大家分享一个我自己封装的upload组件，符合需求可以直接在项目中放到组件目录调用。

template部分代码：

<template>
  <div>
    <a-upload
      name="file"
      :multiple="true"
      :action="uploadAction"
      list-type="picture-card"
      :headers="headers"
      :data="{'isup':1,'bizPath':bizPath}"
      :fileList="fileList"
      :beforeUpload="beforeUpload"
      @preview="handlePreview"
      @change="handleChange"
      :disabled="disabled">
        <div v-if="fileList.length < 8">
          <a-icon type="plus" />
          <div class="ant-upload-text">
            上传
          </div>
        </div>
    </a-upload>
    <a-modal v-if="fileType == 'image'" :visible="previewVisible" width="1400px" :footer="null" @cancel="handleImgCancel">
      <img  alt="example" style="width: 100%" :src="previewSrc" />
    </a-modal>
    <a-modal v-if="fileType == 'video/mp4'" :visible="previewVisible" :footer="null" @cancel="handleVideoCancel">     
      <video alt="example" style="width: 100%" :src="previewSrc" controls>
      </video>
    </a-modal>
  </div>
</template>

script部分代码：

<script>
  import Vue from 'vue'
  import { ACCESS_TOKEN } from "@/store/mutation-types"
  const FILE_TYPE_ALL = "all"
  const FILE_TYPE_IMG = "image"
  const FILE_TYPE_MP4 = "video/mp4"
  const FILE_TYPE_TXT = "file"
  const uidGenerator=()=>{
    return '-'+parseInt(Math.random()*10000+1,10);
  }
  const getFileName=(path)=>{
    if(path.lastIndexOf("\\")>=0){
      let reg=new RegExp("\\\\","g");
      path = path.replace(reg,"/");
    }
    return path.substring(path.lastIndexOf("/")+1);
  }
  export default {
    name: 'JUpload',
    data(){
      return {
        uploadAction:window._CONFIG['domianURL']+"/sys/common/upload",//图片上传地址
        imgErver: window._CONFIG['domianURL'] + '/sys/common/view',//图片预览地址
        videoErver: window._CONFIG['domianURL'] + 'sys/common/view_video',//视频预览地址
        isCreatFile:true,//是否创建文件占位dom
        headers:{},
        fileList: [],
        previewSrc:'',
        previewVisible:false,
      }
    },
    props:{
      text:{
        type:String,
        required:false,
        default:"点击上传"
      },
      fileType:{
        type:String,
        required:false,
        default:FILE_TYPE_ALL
      },
      /*这个属性用于控制文件上传的业务路径*/
      bizPath:{
        type:String,
        required:false,
        default:"temp"
      },
      value:{
        type:[String,Array],
        required:false
      },
      // update-begin- --- author:wangshuai ------ date:20190929 ---- for:Jupload组件增加是否能够点击
      disabled:{
        type:Boolean,
        required:false,
        default: false
      },
    },
    watch:{
      value(val){
        console.log(val)
        if (val instanceof Array) {
          this.initFileList(val.join(','))
        } else {
          this.initFileList(val)
        }
      }
    },
    created(){
      const token = Vue.ls.get(ACCESS_TOKEN);
      this.headers = {"X-Access-Token":token}
    },

    methods:{
      initFileList(paths){
        if(!paths || paths.length==0){
          //return [];
          // update-begin- --- author:os_chengtgen ------ date:20190729 ---- for:issues:326,Jupload组件初始化bug
          this.fileList = [];
          return;
          // update-end- --- author:os_chengtgen ------ date:20190729 ---- for:issues:326,Jupload组件初始化bug
        }
        let fileList = [];
        let arr = paths.split(",")
        for(var a=0;a<arr.length;a++){
          fileList.push({
            uid:uidGenerator(),
            name:getFileName(arr[a]),
            status: 'done',
            url: this.urlDownload+arr[a],
            response:{
              status:"history",
              message:arr[a]
            }
          })
        }
        this.fileList = fileList
      },
      handlePathChange(){
        let uploadFiles = this.fileList
        let path = ''
        if(!uploadFiles || uploadFiles.length==0){
          path = ''
        }
        let arr = [];

        for(var a=0;a<uploadFiles.length;a++){
          if(uploadFiles[a].response){
            arr.push(uploadFiles[a].response.message)
          }      
        }
        if(arr.length>0){
          path = arr.join(",")
        }
        this.$emit('change', path);
      },
      beforeUpload(file){//上传文件前对文件类型判断
        var fileType = file.type;
        if(this.fileType === FILE_TYPE_ALL){        
          this.isCreatFile = true;
          return true;
        }
        else if(fileType === this.fileType){
          this.isCreatFile = true;
          return true;
        }
        else{
          if(this.fileType === FILE_TYPE_IMG){
            if(fileType.indexOf('image')<0){
              this.$message.warning('请上传图片');
              this.isCreatFile = false;
              return false;
            }
          }else if(this.fileType === FILE_TYPE_TXT){
            if(fileType.indexOf('image')>=0){
              this.$message.warning('请上传文件');
              this.isCreatFile = false;
              return false;
            }
          }
          else if(this.fileType === FILE_TYPE_MP4){
            if(fileType.indexOf('mp4')<0){
              this.$message.warning('请上传mp4文件');
              this.isCreatFile = false;
              return false;
            }
          }
        }
        //TODO 扩展功能验证文件大小
      },
      handleChange(info) {
        if(this.isCreatFile == false){
          return false
        }
        let fileList = info.fileList
        if(info.file.status==='done'){
          if(info.file.response.success){
            fileList = fileList.map((file) => {
              if (file.response) {
                file.url = this.urlDownload+file.response.message;
              }
              return file;
            });
          }
          this.$message.success(`${info.file.name} 上传成功!`);
        }else if (info.file.status === 'error') {
          this.$message.error(`${info.file.name} 上传失败.`);
        }else if(info.file.status === 'removed'){
          this.handleDelete(info.file)
        }
        this.fileList = fileList
        if(info.file.status==='done' || info.file.status === 'removed'){
          this.handlePathChange()
        }
      },
      handleImgCancel() {
        this.previewVisible = false;
      },
      handleVideoCancel(){
        this.previewVisible = false;
        let myVideo = document.getElementsByTagName('video');
        let arr = Array.from(myVideo)
        arr.forEach(item =>{//关闭时暂停播放
          item.pause()
        })
      },
      async handlePreview(file) {//判断打开不同文件预览窗口
        if(this.fileType == 'image'){
          if (!file.url && !file.preview) {
            file.preview = await getBase64(file.originFileObj);
          }
          this.previewSrc = file.url || file.preview;
          this.previewVisible = true;
        }
        if(this.fileType == 'video/mp4'){
          this.previewSrc = this.imgErver + '/' + file.response.message;
          this.previewVisible = true;
        }
      },
      handleDelete(file){
        //如有需要新增 删除逻辑
        console.log(file)
      },
    },
    model: {
      prop: 'value',
      event: 'change'
    }
  }
</script>

好人做到底，组件调用也贴上：

<JUpload @change="saveImageUrl" ref="imgUpload" :fileType="'image'" :value="savedImageList"></JUpload>

最后要注意的地方：

 如果需要多次上传，记得在重置组件文件列表，不然会有缓存