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="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="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>