//添加行 js方法      function addTr2(tab, row){            if($("#tab").find("tr").length > 31){                alert('最多添加30条信息');                return;            };            var trHtml="
    
     "                trHtml+="
     
     
      ";                trHtml+="
      
      
       ";                trHtml+="
       
       
        ";                trHtml+="
        
        
         ";                trHtml+="
         
          公
          私";                trHtml+="
          ";                trHtml+=" 
          ";                trHtml+=" 
          ";                trHtml+=" 
          ";                trHtml+=""                            addTr(tab, row, trHtml);          }      function addTr(tab, row, trHtml){             //获取table最后一行 $("#tab tr:last")             //获取table第一行 $("#tab tr").eq(0)             //获取table倒数第二行 $("#tab tr").eq(-2)         var $tr=$("#"+tab+" tr").eq(row);         if($tr.size()==0){            alert("指定的table id或行数不存在！");            return;         }         $tr.after(trHtml);      }            //删除表格中的指定行        function deleteTr(obj) {              $(obj).closest('tr').remove();        }            //操作的表格      
          
                                                                               
                                                                                       
           
            货品名称                
            
             货品规格                
             
              数量                
              
               单位                
               
                公/私                
                
                 采购单位                
                 
                  姓名                
                  
                   备注                
                   
                                                 
                    
                                                         
                                         
                     
                                                                          
                                          
                      
                                                                           
                                           
                       
                                                                            
                                            
                        
                                                                             
                         
                                                  
                          公                        
                          私