<select name="slt" size="1" onchange="ddddd(this)">
<option selected>------</option>
<option>1</option>
<option>2</option>
</select><input type=text name=t1 value="111" size="22">
<input type=text name=t2 value="222" size="22">
<script language="javascript">
<!--
function ddddd(o)
{
switch(o.selectedIndex)
{
case 1 :
t1.disabled = false;
t2.disabled = true;
break;
case 2 :
t1.disabled = true;
t2.disabled = false;
break;
default :
t1.disabled = false;
t2.disabled = false;
break;
}}
//-->
</script>
<option selected>------</option>
<option>1</option>
<option>2</option>
</select><input type=text name=t1 value="111" size="22">
<input type=text name=t2 value="222" size="22">
<script language="javascript">
<!--
function ddddd(o)
{
switch(o.selectedIndex)
{
case 1 :
t1.disabled = false;
t2.disabled = true;
break;
case 2 :
t1.disabled = true;
t2.disabled = false;
break;
default :
t1.disabled = false;
t2.disabled = false;
break;
}}
//-->
</script>
<p>
<select onchange="javascript:aa(this);">
<option value="1" selected >1</option>
<option value="2">2</option>
</select>
</p>
<input type="text" name="text1" value="AAAAAAAA"></input>
<input type="text" name="text2" value="BBBBBBBB"></input>
</body>
<script language="javascript">
function aa(obj){
alert(obj.value)
text1.readOnly=false
text2.readOnly=true
text1.disabled=true
text2.disabled=false
}你再自己修改修改吧
<option selected>------</option>
<option>1</option>
<option>2</option>
</select><input type=text name=t1 value="111" size="22">
<input type=text name=t2 value="222" size="22">
<script language="javascript">
<!--
function ddddd(o)
{
switch(o.selectedIndex)
{
case 1 :
t1.readOnly = false;
t2.readOnly = true;
t1.style.backgroundColor= "";
t2.style.backgroundColor= "#C0C0C0";
break;
case 2 :
t1.readOnly = true;
t2.readOnly = false;
t1.style.backgroundColor= "#C0C0C0";
t2.style.backgroundColor= "";
break;
default :
t1.readOnly = false;
t2.readOnly = false;
t1.style.backgroundColor= "";
t2.style.backgroundColor= "";
break;
}}
//-->
</script>
真是太感谢老大帮忙了