关于javascript嵌套循环的效率问题，请高手来看看！！！！

如果不执行这个  for(var  i=2;  i<  parseInt(rowCount)+2;  i++)  
                       {  
                               if(i.toString().length==1)  
                               {  
                                               i='0'+i.toString();  
                               }                                
                               var  strMaterialID=document.getElementById("dgdMaterialRequest_ctl"+i+"_lblMaterialID").innerText;  
                               var  strDrawQuantity=document.getElementById("dgdMaterialRequest_ctl"+i+"_txtDrawQuantity").value;  
                               if(strMaterialID==materialID    &&  strDrawQuantity  !=""  )  
                               {  
                                       sumDrawQuantity=parseFloat(sumDrawQuantity)  +  parseFloat(strDrawQuantity);  
                               }  
                       }  
循环，则速度会快很多，但是这个循环是要查找相同的物料编码对应的需求数量的，一定要找出来相加，然后判断库存是否足够！！！