loadFile(fileName, content){ // 前端自动生成下载文件
            var aLink = document.createElement('a');
            var blob = new Blob([content], {
                type: 'text/plain'
            });
            aLink.download = fileName;
            aLink.href = URL.createObjectURL(blob);
            aLink.click();
            URL.revokeObjectURL(blob);
        }