做个笔记，后续自己可以看看，将页面的一个Table直接输出为excel文件，亲测有用。
//下载excel
function downloadExcel() {
var uri = 'data:application/vnd.ms-excel;base64,';
var template = `<html xmlns:o="urn:schemas-microsoft-com:office:office"
xmlns:x="urn:schemas-microsoft-com:office:excel"
xmlns="http://www.w3.org/TR/REC-html40">
<meta http-equiv="content-type" content="application/vnd.ms-excel; charset=UTF-8">
<head><!--[if gte mso 9]><xml><x:ExcelWorkbook><x:ExcelWorksheets><x:ExcelWorksheet>
<x:Name>sheet1</x:Name>
<x:WorksheetOptions><x:DisplayGridlines/></x:WorksheetOptions></x:ExcelWorksheet>
</x:ExcelWorksheets></x:ExcelWorkbook></xml><![endif]-->
</head><body><table>`+ $('#idData').html() + `</table></body></html>`;
window.location.href = uri + window.btoa(unescape(encodeURIComponent(template)));
};
标签：excel,JS,window,template,var,页面 From： https://www.cnblogs.com/wonder223/p/17586840.html