vue导出，万能版

不特意限定类型，把文件类型拼在文件名后面就好，比如：文章名.txt

RecoverListExcel(params).then(res => {
        let fileName = decodeURI(res.headers['filename'])
        const url = window.URL.createObjectURL(new Blob([res.data]));
        const link = document.createElement('a');
        link.style.display = "none";
        link.href = url;
        link.setAttribute('download', fileName);
        document.body.appendChild(link);
        link.click();
        document.body.removeChild(link);
        window.URL.revokeObjectURL(url);
})

RecoverListExcel接口名