insertCell默认插入标签是td，如何插入列时标签变为th

arr3[j] = newRow.insertCell();
arr3[j].innerHTML = result[rlen-1][arr1[j]];
//上面2行生成表格的最后一行，最后一行想要加特效，需要和表格区分开，想要将标签td变为th。

                    var s=document.getElementById("Tgzze")//获取html中table
                    var arr1=["a1","a2","a3","a4","a5","a6","a7","a8","a9","a10","a11","a12","a13","a14","a15","a16"];
                    var arr2=["b1","b2","b3","b4","b5","b6","b7","b8","b9","b10","b11","b12","b13","b14","b15","b16"];
                    var arr3=[];arr4=[];
                    var rlen=result.length;
                    if (result) {
                      for (var i = 0; i < rlen; i++) {
                         if(i <  rlen-1) {
                             let newRow = s.insertRow(); //新建一行
                             for (var j = 0; j < 16; j++) {
                                 arr3[j] = newRow.insertCell();
                                 arr3[j].innerHTML = result[i][arr1[j]]; 

                             }
                             }
                         
                         else
                          {
                             let newRow = s.insertRow(); //新建一行
                             for (var j = 0; j < 16; j++) {
                                    var obj = document.createElement("th");
                                                                        newRow.appendChild(obj);
                                    obj.innerHTML = result[rlen-1][arr1[j]];

                                //上面2行生成表格的最后一行，想要加特效，需要和表格区分开，将标签td变为th。
                             }
                         }
                  }
                  }
                  }

               //以下控制鼠标点击单元格变色
            $('th').click(function(){
            if ($(this).css('background-color') === 'rgb(255, 0, 0)') {
            $(this).css('background-color', '#ffd400');
            } else {
            $(this).css('background-color', 'red');
            }
            });

var obj = document.createElement("th");
table.addChild(obj);
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