download() {

       this.tableLoading = true;

       console.log(this.selectionLen);

       let docIds = [];

       this.selectionLen.forEach((item, index) => {

         docIds.push(item.id);

       });

       let params = {

         zipName: "downloadFile",

         ids: docIds,

         company: this.userinfo.account_name

       };

       axios({

         // 用axios发送post请求

         method: "post",

         url:

           "http://xxx/pm/project/deliverable/download/zip", // 请求地址

         data: params, // 参数

         headers: {

           "content-type": "application/json; charset=utf-8"

         },

         responseType: "blob" // 表明返回服务器返回的数据类型

       }).then(res => {

         this.tableLoading = false;

         this.downloadFile(res.data);

       });

     },

 downloadFile(data) {

       let blob = new Blob([data], { type: "application/zip" });

       let url = window.URL.createObjectURL(blob);

       const link = document.createElement("a"); // 创建a标签

       link.href = url;

       let date = new Date();

       link.download = "fileDown" + FormatTime("YYYY-mm-dd HH:MM", date); // 重命名文件

       link.click();

       URL.revokeObjectURL(url); // 释放内存

     }