一个简单的JS脚本问题，我不熟悉，帮帮忙

[anison]

熟悉js的能帮忙一下吗？
我在.net中要实现这样一个功能,txtTrainLen（文本框）失去焦点时把txtTestLen（文本框）的值设置为lbCntSum（标签）的值减去txtTrainLen得到的结果
txtTrainLen.Attributes.Add("onblur", "document.getElementById('txtTestLen').value=document.getElementById('lbCntSum').innerHTML-document.getElementById('txtTrainLen').value;");

怎么修改呀

[mengxj85]

'txtTestLen'改成("<%= txtTestLen.ClientID %>")

[igelf]

先转化成整型.

[nbgcqlk]

我在.net中要实现这样一个功能,txtTrainLen（文本框）失去焦点时把txtTestLen（文本框）的值设置为lbCntSum（标签）的值减去txtTrainLen得到的结果

    <form id="form1" runat="server">
<asp:TextBox id="txtTrainLen" onblur="Change()" runat="server" />
<asp:TextBox id="txtTestLen" runat="server" />
<asp:Label id="lbCntSum" runat="server" Text="5" />
<script type="text/javascript">
function Change()
{
var txtTrainLen=document.getElementById("txtTrainLen").value;
var lbSum=document.getElementById("lbCntSum").innerText;
document.getElementById("txtTestLen").value=lbSum-txtTrainLen;
}
</script>

    </form>

[后浪]

减号两边得到的数转整形

[sunrain_yingxi]

function Change()
{
var txtTrainLen=parseFloat(document.getElementById("txtTrainLen").value);
var lbSum=parseFloat(document.getElementById("lbCntSum").innerText);
document.getElementById("txtTestLen").value=lbSum-txtTrainLen;
}

[antiking]

先转化数据类型,楼上的就行

[庚武讲堂]

都是高手来的