text文本框数字相加
<SCRIPT   LANGUAGE=javascript>  
function   sumNum(){
        var   number1   =   isNaN(parseInt(importantForm.leader.value,10))?0:parseInt(importantForm.leader.value,10);  
        var   number2   =   isNaN(parseInt(importantForm.dept.value,10))?0:parseInt(importantForm.dept.value,10);  
        var   number3   =   isNaN(parseInt(importantForm.province.value,10))?0:parseInt(importantForm.province.value,10);  
        var   number4   =   isNaN(parseInt(importantForm.stat.value,10))?0:parseInt(importantForm.stat.value,10);  

importantForm.total.value   =   number1   +   number2     +   number3   +   number4;

}
</SCRIPT>  


<%for(int   i=0;i <5;i++){%>
<tr   align= "center ">
<td   class= "template-td-6 "> </td>
<td   class= "template-td-6 "> <input   id= "leader <%=i%> "   type= "text "   class= "in "   style= "width:100% "   onpropertychange= "sumNum() "> </td>
<td   class= "template-td-6 "> <input   id= "dept <%=i%> "   type= "text "   class= "in "   style= "width:100% "   onpropertychange= "sumNum() "> </td>
<td   class= "template-td-6 "> <input   id= "province <%=i%> "   type= "text "   class= "in "   style= "width:100% "   onpropertychange= "sumNum() "> </td>
<td   class= "template-td-6 "> <input   id= "stat <%=i%> "   type= "text "   class= "in "   style= "width:100% "   onpropertychange= "sumNum() "> </td>
<td   class= "template-td-6 "> <input   id= "total1 <%=i%> "   type= "text "   class= "in "   style= "width:100% "> </td>
</tr>
<%}%>

如题,如果是一个 <tr> ,相加好处理,上面的脚本就能实现
但是tr是多个,由for循环确定,怎样在脚本获取每一个tr中的文本框ID相加




------解决方案--------------------
<script>
function sumNum(obj){
var trObj=obj.parentNode.parentNode;
var number1 = isNaN(parseInt(trObj.childNodes[1].firstChild.value,10))?0:parseInt(trObj.childNodes[1].firstChild.value,10);
var number2 = isNaN(parseInt(trObj.childNodes[2].firstChild.value,10))?0:parseInt(trObj.childNodes[2].firstChild.value,10);
var number3 = isNaN(parseInt(trObj.childNodes[3].firstChild.value,10))?0:parseInt(trObj.childNodes[3].firstChild.value,10);
var number4 = isNaN(parseInt(trObj.childNodes[4].firstChild.value,10))?0:parseInt(trObj.childNodes[4].firstChild.value,10);
trObj.childNodes[5].firstChild.value = number1 + number2 + number3 + number4;
}
</script>

将所有onpropertychange= "sumNum() "换成onpropertychange= "sumNum(this) "