exportExcel(options)

• options.fileName
• options.extensionType : default true
• options.showHeader : default true
• options.showTop : default true
• options.showFooter : default true

grid1.exportExcel({fileName: 'download', extensionType: 'xlsx', showHeader: false});
grid1.exportExcel({fileName: 'download', extensionType: 'xls'});