vue图片压缩与批量上传方式

<template>
  <div class="">
    <el-upload ref="pictureUpload"
               :multiple="true"
               :action="uploadFileUrl"
               list-type="picture-card"
               :disabled="check"
               :on-change="handleOnChange"
               :before-upload="beforUpload"
               :on-success="handleUploadSuccess"
               :auto-upload="false"
               :file-list="showFile">
      <i slot="default"
         class="el-icon-plus"></i>
      <div slot="file"
           slot-scope="{file}">
        <img class="el-upload-list__item-thumbnail"
             :src="https://www.jb51.net/file.url"
             alt="">
        <span class="el-upload-list__item-actions">
          <span class="el-upload-list__item-preview"
                :disabled="true"
                @click="handlePictureCardPreview(file)">
            <i class="el-icon-zoom-in"></i>
          </span>
          <span v-if="!check"
                class="el-upload-list__item-delete"
                @click="handleRemoveThis(file)">
            <i class="el-icon-delete"></i>
          </span>
        </span>
      </div>
    </el-upload>
    <el-button style="margin-left: 10px;"
               size="small"
               v-if="!check"
               type="success"
               @click="submitUpload">图片提交到服务器</el-button>
    <el-dialog :visible.sync="dialogVisible"
               title="预览"
               width="800"
               append-to-body>
      <img :src="https://www.jb51.net/dialogImageUrl"
           style="display: block; max-width: 100%; margin: 0 auto;">
    </el-dialog>
  </div>
</template>
 
<script>
import { getToken } from "@/utils/auth";
import * as imageConversion from 'image-conversion';
import { delImg } from "@/api/system/vote"
export default {
  name: 'jImageUpload',
  props: ['imageUrl', 'check'],
  data () {
    return {
      AllLoading: [],
      oldImg: null,
      dialogImageUrl: '',
      checkUpload: false,
      fileList: [],
      returnFileList: [],
      showFile: [],
      urlStr: [],
      editFile: [],
      dialogVisible: false,
      uploadFileUrl: process.env.VUE_APP_BASE_API + "/sys/minio/upload", // 上传的图片服务器地址
      headers: {
        Authorization: "Bearer " + getToken(),
      },
    };
  },
  mounted () { // 在mounted时候赋值，子组件只更新一次，后面重新选择后展示此组件的数据，不再更新
    this.oldImg = this.imageUrl
    this.stringToImage(this.oldImg)
  },
  watch: {
    imageUrl: function (val) {
      // // console.log('val')
      // // console.log(val)
      this.oldImg = val
      this.stringToImage(this.oldImg)
    }
  },
  created () {
  },
  methods: {
    stringToImage (imageString) {
      this.showFile = []
      this.editFile = []
      if (imageString != null && imageString != '' && imageString != undefined) {
        this.urlStr = imageString.split(",");
        this.urlStr.forEach(item => {
          let obj = new Object();
          let obj1 = new Object();
          obj1.url = item;
          if (item.indexOf("http") < 0) {
            item = process.env.VUE_APP_BASE_MINIO_API + item;
          }
          obj.url = item;
          this.showFile.push(obj);
          this.editFile.push(obj1);
        });
      }
    },
    arryToString (arry) {
      var imgString = ""
      if (arry.length > 0) {
        for (var i = 0; i < arry.length; i++) {
          if (i < arry.length - 1) {
            imgString += arry[i].url + ",";
          } else {
            imgString += arry[i].url
          }
        }
      }
      return imgString
    },
    // 点击查看图片
    handlePictureCardPreview (file) {
      this.dialogImageUrl = file.url;
      this.dialogVisible = true;
    },
    handleOnChange (file, fileList) {
      if (file.name.indexOf(',') !== -1) {
        this.msgError("上传的文件名称中不允许出现英文逗号！");
        this.handleRemoveThis(file)
        return false
      } else {
        const isLt2M = file.size / 1024 / 1024 < 1;
        if (!isLt2M) {
          console.log(file)
          // return new Promise((resolve) => {
          // 压缩到600KB,这里的600就是要压缩的大小,可自定义
          imageConversion.compressAccurately(file.raw, 600).then(res => {
            file.raw = new window.File([res], file.name, { type: file.type })
            file.size = file.raw.size
            this.fileList.push(file)
          });
          // })
        } else {
          this.fileList.push(file)
        }
      }
    },
    // 文件上传
    submitUpload () {
      // 全屏禁用开启
      this.AllLoading = this.$loading({
        lock: true,
        text: '图片上传中...',
        spinner: 'el-icon-loading',
        background: 'rgba(0, 0, 0, 0.7)'
      })
      let fileList = []
      let { uploadFiles, action, data } = this.$refs.pictureUpload
      // console.log(uploadFiles)
      // uploadFiles.forEach(file => {
      //   imageConversion.compressAccurately(file.raw, 600).then(res => {
      //     file.raw = new window.File([res], file.name, { type: file.type })
      //     file.size = file.raw.size
      //   });
      // })
      // console.log(uploadFiles)
      this.uploadFiles({
        uploadFiles,
        data,
        action,
        success: (response) => {
          var res = JSON.parse(response)
          // this.$refs.uploadFile.clearFiles();
          // console.log(res)
          this.msgSuccess("图片上传成功！")
          this.AllLoading.close()
          res.data.fileName.forEach(item => {
            let obj = new Object();
            let obj1 = new Object();
            obj.url = process.env.VUE_APP_BASE_MINIO_API + item;
            obj1.url = item;
            this.editFile.push(obj1)
            this.showFile.push(obj)
            var imgString = this.arryToString(this.editFile)
            this.$emit('returnUrl', imgString)
          })
        },
        error: (error) => {
          this.msgError("图片上传失败！")
          this.AllLoading.close()
          console.log('图片上传失败！', error)
        }
      })
    },
    /**
     * 自定义上传文件
     * @param fileList 文件列表
     * @param data 上传时附带的额外参数
     * @param url 上传的URL地址
     * @param success 成功回调
     * @param error 失败回调
     */
    uploadFiles ({ uploadFiles, headers, data, action, success, error }) {
      let form = new FormData()
      // 文件对象
      uploadFiles.map(file => form.append("filedatas", file.raw))
      // 附件参数
      for (let key in data) {
        form.append(key, data[key])
      }
      let xhr = new XMLHttpRequest()
      // 异步请求
      xhr.open("post", action, true)
      // 设置请求头
      xhr.setRequestHeader("Authorization", getToken());
      xhr.onreadystatechange = function () {
        if (xhr.readyState == 4) {
          if ((xhr.status >= 200 && xhr.status < 300) || xhr.status == 304) {
            success && success(xhr.responseText)
          } else {
            error && error(xhr.status)
          }
        }
      }
      xhr.send(form)
    },
    // 移除图片
    handleRemoveThis (file) {
      // console.log(file)
      // 在控件中移除图片
      this.$refs.pictureUpload.handleRemove(file)
      // 获取图片在数组中的位置
      var number = this.showFile.indexOf(file)
      // 获取返回的文件url中此文件的url
      var file = process.env.VUE_APP_BASE_MINIO_API + this.editFile[number].url.toString()
      var fileItemList = file.split('/')
      // 执行文件删除
      delImg(fileItemList[4]).then(response => {
        // // console.log(response)
      })
      this.editFile.splice(number, 1)
      this.showFile.splice(number, 1)
      var imgString = this.arryToString(this.editFile)
 
      this.$emit('returnUrl', imgString)
    },
    // 上传前
    beforUpload (file) {
      console.log("上传之前")
      console.log(file)
      if (file.name.indexOf(',') !== -1) {
        this.msgError("上传的文件名称中不允许出现英文逗号！");
        return false
      } else {
        // this.checkUpload = true
        this.fileList.push(file)
        const isLt2M = file.size / 1024 / 1024 < 1;
        if (!isLt2M) {
          return new Promise((resolve) => {
            // 压缩到100KB,这里的100就是要压缩的大小,可自定义
            imageConversion.compressAccurately(file.raw, 600).then(res => {
              resolve(res);
            });
          })
        }
      }
    },
    // 上传成功
    handleUploadSuccess (res, file, fileList) {
      // this.checkUpload = false
      // console.log("上传成功")
      // console.log(res)
      // console.log(fileList)
      console.log(this.$refs.pictureUpload.uploadFiles)
      this.$message.success("上传成功");
      // fileList.forEach(item => {
      //   let obj = new Object();
      //   let obj1 = new Object();
      //   if (item.response !== undefined) {
      //     obj.url = process.env.VUE_APP_BASE_MINIO_API + item.response.fileName;
      //     obj1.url = item.response.fileName;
      //     this.editFile.push(obj1)
      //     this.showFile.push(obj)
      //     var imgString = this.arryToString(this.editFile)
      //     this.$emit('returnUrl', imgString)
      //   }
      // })
      let obj = new Object();
      let obj1 = new Object();
      obj.url = process.env.VUE_APP_BASE_MINIO_API + res.fileName;
      obj1.url = res.fileName;
      this.editFile.push(obj1)
      this.showFile.push(obj)
      var imgString = this.arryToString(this.editFile)
      this.$emit('returnUrl', imgString)
    },
    handleUploadError () {
      this.$message({
        type: "error",
        message: "上传失败",
      });
      this.loading.close();
    },
  },
};
</script>
 
<style scoped lang="scss">
.image {
  position: relative;
  .mask {
    opacity: 0;
    position: absolute;
    top: 0;
    width: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    transition: all 0.3s;
  }
  &:hover .mask {
    opacity: 1;
  }
}
</style>