访问

[eric_uugames]

<table>
<tr id=tr1>
<td>td1</td><td id=td2>td2</td>
</tr>
<table>

如何访问tr1的各个子数据（如果不用id)
document.all('td2')可以访问到td2
请问如何访问td1

[cpp2017]

<table>
<tr id=tr1>
<td>td1</td><td id=td2>td2</td>
</tr>
<table>
<SCRIPT LANGUAGE=javascript>
<!--
alert(document.all.tr1.children[0].innerHTML);
//-->
</SCRIPT>

[vjlin]

<table>
<tr id=tr1>
<td>td1</td><td id=td2>td2</td>
</tr>
<table>
<script>
var oTr = document.getElementById("tr1");
var oList = oTr.children;
for(var i=0;i<oList.length;i++) {
oList[i].bgColor = "#ff3300";

}
</script>