打包为压缩包同时下载

import JSZip from '../js/lib/jszip.min'
import axios from '../js/lib/axios.min'
import {saveAs} from '../js/lib/FileSaver'
{
    let that = this
    const fileData = [];
    const zip = new JSZip();
    const cache = {};
    const promises = [];
    if(that.transferList.length === 0) {
      that.$message({
        type: 'warning',
        message: '请选择'
      })
      return
    }
    
    this.fileList.forEach(item => {
      if(item.picafter !== '') {
        fileData.push(item)
      }
    })
    const getFile = url => {
      return new Promise((resolve, reject) => {
        axios({
          method: 'get',
          url: url,
          responseType: 'arraybuffer'
        }).then(data => {
          /*返回二进制流文件*/
          resolve(data.data)
        }).catch(error => {
          reject(error.toString())
        })
      })
    };
    fileData.forEach((item, i) => {
      const promise = getFile(item.picafter).then((data) => { // 下载文件, 并存成ArrayBuffer对象
        let file_name = (item.name ? item.name : i) + '.' + item.type; // 获取文件名
        zip.file(file_name, data, {binary: true}); // 逐个添加文件
        cache[file_name] = data
      });
      promises.push(promise);
    });
    Promise.all(promises).then(() => {
      console.log(promises)
      zip.generateAsync({
        type: "blob"
      }).then(content => {
        console.log(content)
        that.$message({
          message: `下载成功`,
          type: "success"
        });
        // 生成二进制流
        saveAs(content, "风格迁移文件.zip"); // 利用file-saver保存文件
      });
    });
}