<script language="javascript"> //四舍五入 //作者:鲁元忠 Number.prototype.toFixed=function(len) 
{ 
var add = 0; var s,temp; var l = this + ""; var start = l.indexOf("."); if(l.substr(start+len+1,1)>=5)add=1; var temp = Math.pow(10,len); s = Math.floor(this * temp) + add; return s/temp; 
} //实现计算金额 //作者:鲁元忠 function count(obj) { var regInt = /^d+$/; var regMondy = /^(0|[1-9]d*)$|^(0|[1-9]d*).(d+)$/; // 找出TextBox var objParent = obj.parentElement.parentElement; var textBoxs = objParent.getElementsByTagName("input"); var TxtGoodsNum = null; var TxtGoodsSinglePrice = null; var TxtGoodsSumPrice = null; for( var i=0;i < textBoxs.length;i ++) 
{ 
if(textBoxs[i].id.indexOf("txtGoodsNum") != -1) { TxtGoodsNum = textBoxs[i]; 
} else if(textBoxs[i].id.indexOf("txtGoodsSinglePrice") != -1) { TxtGoodsSinglePrice = textBoxs[i]; } else if(textBoxs[i].id.indexOf("txtGoodsSumPrice") != -1) { TxtGoodsSumPrice = textBoxs[i]; } } if(!regInt.test(TxtGoodsNum.value)) { alert("数量只能是数字，请您重新输入数量。"); return; } if(!regMondy.test(TxtGoodsSinglePrice.value)) { alert("单价只能是数字，请您重新输入单价。"); return; } var GoodsNum = parseInt(TxtGoodsNum.value); //数量 var SinglePrice = parseFloat(TxtGoodsSinglePrice.value); //单价 var GoodsSumPrice = GoodsNum * SinglePrice; TxtGoodsSumPrice.value = GoodsSumPrice.toFixed(3).toString(); } </script> 调用：<asp:TextBox id=txtGoodsNum onblur=count(this) runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.Goods_Num") %>' Width="60px">