JS导出Excel文件（数据量过大会导致网页崩溃导出失败）
function JSONToExcelConvertor(JSONData, FileName) {
//先转化json
if (JSONData.length == 0) {
layer.msg("请选择导出的数据！");
return false;
}
var arrData = typeof JSONData != 'object' ? JSON.parse(JSONData) : JSONData;
var excel = '<table>';
var row = "<tr style='text-align:center;'>";
//设置表头
//var keys = Object.keys(JSONData[0]); //循环取JSON文件的Key值作为表头
//keys.forEach(function (item) {
// row += "<td>" + item + '</td>';
//});
//手动写入表头
row += "<th style=\"border-bottom: solid 1px #000000;border-right: solid 1px #000000;border-left: solid 1px #000000; font-family: 宋体;\">列1</th>";
row += "<th style=\"border-bottom: solid 1px #000000;border-right: solid 1px #000000;border-left: solid 1px #000000; font-family: 宋体;\">列2</th>";
row += "<th style=\"border-bottom: solid 1px #000000;border-right: solid 1px #000000;border-left: solid 1px #000000; font-family: 宋体;\">列3</th>";
//换行
excel += row + "</tr>";
//设置数据
for (var i = 0; i < arrData.length; i++) {
var row = "<tr>";
row += '<td>' + arrData[i]['columns_a'] + '</td>';
row += '<td>' + arrData[i]['columns_b'] + '</td>';
row += '<td>' + arrData[i]['columns_c'] + '</td>';
//for (var index in arrData[i]) {
//console.log(arrData[i][index]);
//var value = arrData[i][index] === "." ? "" : arrData[i][index];
//row += '<td>' + arrData[i][index] + '</td>';
//}
excel += row + "</tr>";
}
excel += "</table>";
var excelFile = "<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'>";
excelFile += '<meta http-equiv="content-type" content="application/vnd.ms-excel; charset=UTF-8">';
excelFile += '<meta http-equiv="content-type" content="application/vnd.ms-excel';
excelFile += '; charset=UTF-8">';
excelFile += "<head>";
excelFile += "<!--[if gte mso 9]>";
excelFile += "<xml>";
excelFile += "<x:ExcelWorkbook>";
excelFile += "<x:ExcelWorksheets>";
excelFile += "<x:ExcelWorksheet>";
excelFile += "<x:Name>";
excelFile += "{worksheet}";
excelFile += "</x:Name>";
excelFile += "<x:WorksheetOptions>";
excelFile += "<x:DisplayGridlines/>";
excelFile += "</x:WorksheetOptions>";
excelFile += "</x:ExcelWorksheet>";
excelFile += "</x:ExcelWorksheets>";
excelFile += "</x:ExcelWorkbook>";
excelFile += "</xml>";
excelFile += "<![endif]-->";
excelFile += "</head>";
excelFile += "<body>";
excelFile += excel;
excelFile += "</body>";
excelFile += "</html>";
var uri = 'data:application/vnd.ms-excel;charset=utf-8,' + encodeURIComponent(excelFile);
var link = document.createElement("a");
link.href = uri;
link.style = "visibility:hidden";
link.download = FileName + ".xls";
document.body.appendChild(link);
link.click();
document.body.removeChild(link);
}
