原生Ajax实现前端导出SpringBoot生成的Excel

$('#export').on('click', function() {
  if(confirm("最多只能导出1万条，确定导出吗？")){
  
     
      var createTimeStart = $('#createTimeStart').val();
      var createTimeEnd = $('#createTimeEnd').val();
      var status = $("#status").val();
     
      //要请求的Url和携带的参数
      var url = layui.setter.baseUrl + "/demo/export?createTimeStart=" + createTimeStart
       + "&createTimeEnd=" + createTimeEnd +"&status=" + status;
      var xhr = new XMLHttpRequest();
      //设置响应类型为blob类型
      xhr.responseType = "blob";
      xhr.onload = function () {
          if (this.status == "200") {
            
            var content = this.response;
            var blob = new Blob([content]);
            
            var fileName = "导出数据.xlsx";
            if ("download" in document.createElement("a")) {
              var elink = document.createElement("a");
              elink.download = fileName;
              elink.style.display = "none";
              elink.href = URL.createObjectURL(blob);
              document.body.appendChild(elink);
              elink.click();
              URL.revokeObjectURL(elink.href); 
              document.body.removeChild(elink);