jquery 实现文本框自动求和！！

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这样吗？
<!DOCTYPE html>
<html>
<head>
<title>jQuery</title>
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.5.1/jquery.min.js"></script>
</head><body>
</body>
<input type="text" id="txt1" /> +
<input type="text" id="txt2" /> =
<input type="text" id="txt3" />
<script type="text/javascript">
$(function(){
    var func = function(){
        var val = parseFloat($('#txt1').val()) + parseFloat($('#txt2').val());
        $('#txt3').val(val);
    };
    $('#txt1').change(func);
    $('#txt2').change(func);
});
</script>
</html>
修改下<script type="text/javascript">
$(function(){
    var func = function(){
        var val = parseFloat($('#txt1').val()) + parseFloat($('#txt2').val());
        $('#txt3').val(val);
    };
    $('#txt1,#txt2').change(func).keyup(func);
});
</script>
引用楼主 skydemo 的回复:
jquery 实现文本框自动求和！！首先你就没有说清楚，
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default4.aspx.cs" Inherits="_601_Default4" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>无标题页</title>    <script src="../jquery-1.4.2.min.js" type="text/javascript"></script>
    <script type="text/javascript">
        $(function(){
            $("input[name='txt']").blur(function(){
                var count_1 = $.trim($("#txtCount1").val());
                var count_2 = $.trim($("#txtCount2").val());

                if(count_1 != "" && count_2 != "")
                {
                    $("#txtTotal").val(parseInt(count_1)+parseInt(count_2));
                }
            });
        });
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <input id="txtCount1" name="txt" type="text" /> +
        <input id="txtCount2" name="txt" type="text" /> =
        <input id="txtTotal" name="txt" type="text" readonly="readonly" />
    </div>
    </form>
</body>
</html>
textbox事件来激发js事件获取输入的值累加
js写写就可以了么，干嘛用jq
<head runat="server">
    <title>无标题页</title>
    <script language="javascript" type="text/javascript">
    function tot()
    {
       var aa=document.getElementById("Text1")
       var bb=document.getElementById("Text2")
       var cc=document.getElementById("Text3")
       if(aa.value!=""&&bb.value!="")
       {
       cc.value=parseInt(aa.value)+parseInt(bb.value)
       }
    }
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <input id="Text1" type="text" onkeyup="tot()"/>+<input id="Text2" type="text" onkeyup="tot()"/>=<input id="Text3" type="text" readonly="readonly"/>
    </div>
    </form>
</body>