vue项目里面预览下载附件

    // 预览附件
    handlePreview(file) {
      console.log(file);
      if (file.name.indexOf("txt") == "-1") {
        const link = document.createElement("a");
        document.body.appendChild(link);
        link.style.display = "none";
        link.setAttribute(
          "href",
          file.url + "?response-content-type=application/octet-stream"
        ); //设置下载文件的url地址
        link.target = "_blank";
        document.body.appendChild(link);
        link.click();
        document.body.removeChild(link);
      } else {
        let element = document.createElement("a");
        element.setAttribute(
          "href",
          "data:text/plain;charset=utf-8," + file.url
        );
        element.setAttribute("download", file.name);
        element.style.display = "none";
        element.click();
      }
    }