<script language="javascript">
function ichange(){
if (document.all.c.value=="a"){
if (document.all.d.value==document.all.b.value){
alert("清除b");
}
else{
document.all.a.value=document.all.d.value;
}
}
if (document.all.c.value=="b"){
if (document.all.d.value==document.all.a.value){
alert("清除a");
}
else{
document.all.b.value=document.all.d.value;
}
}
}
</script>
<table width="200" border="1"><tr>
<td><input type="text" name="a" value=""></td>
</tr>
<tr>
<td><input type="text" name="b" value=""></td>
</tr>
<tr>
<td><select name="c">
<option value="a">a</option>
<option value="b">b</option>
</select></td>
</tr>
<tr>
<td><select name="d">
<option value="0">0</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
<option value="6">6</option>
<option value="7">7</option>
<option value="8">8</option>
<option value="9">9</option>
</select></td>
</tr>
<tr>
<td><input type="button" name="button" onClick="javascript:ichange();" value="提交"></td>
</tr></table>
function ichange(){
if (document.all.c.value=="a"){
if (document.all.d.value==document.all.b.value){
alert("清除b");
}
else{
document.all.a.value=document.all.d.value;
}
}
if (document.all.c.value=="b"){
if (document.all.d.value==document.all.a.value){
alert("清除a");
}
else{
document.all.b.value=document.all.d.value;
}
}
}
</script>
<table width="200" border="1"><tr>
<td><input type="text" name="a" value=""></td>
</tr>
<tr>
<td><input type="text" name="b" value=""></td>
</tr>
<tr>
<td><select name="c">
<option value="a">a</option>
<option value="b">b</option>
</select></td>
</tr>
<tr>
<td><select name="d">
<option value="0">0</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
<option value="6">6</option>
<option value="7">7</option>
<option value="8">8</option>
<option value="9">9</option>
</select></td>
</tr>
<tr>
<td><input type="button" name="button" onClick="javascript:ichange();" value="提交"></td>
</tr></table>
function ichange(){
if (document.all.c.value=="a"){
if (document.all.b.value.indexOf(document.all.d.value)>-1){
alert("清除b");
}
else{
document.all.a.value=document.all.a.value+document.all.d.value;
}
}
if (document.all.c.value=="b"){
if (document.all.a.value.indexOf(document.all.d.value)>-1){
alert("清除a");
}
else{
document.all.b.value=document.all.b.value+document.all.d.value;
}
}
}
</script>
<table width="200" border="1"><tr>
<td><input type="text" name="a" value=""></td>
</tr>
<tr>
<td><input type="text" name="b" value=""></td>
</tr>
<tr>
<td><select name="c">
<option value="a">a</option>
<option value="b">b</option>
</select></td>
</tr>
<tr>
<td><select name="d">
<option value="0">0</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
<option value="6">6</option>
<option value="7">7</option>
<option value="8">8</option>
<option value="9">9</option>
</select></td>
</tr>
<tr>
<td><input type="button" name="button" onClick="javascript:ichange();" value="提交"></td>
</tr></table>
如果A中已经有常数1,当再次提交1时,保持A中原来的常数不变就可以了。
还是要麻烦修改一下。感谢!!
function ichange(){
if (document.all.c.value=="a"){
if (document.all.b.value.indexOf(document.all.d.value)>-1){
alert("清除b");
}
else if(document.all.a.value.indexOf(document.all.d.value)>-1){
alert("a中已有");
}
else{
document.all.a.value=document.all.a.value+document.all.d.value;
}
}
if (document.all.c.value=="b"){
if (document.all.a.value.indexOf(document.all.d.value)>-1){
alert("清除a");
}
else if(document.all.b.value.indexOf(document.all.d.value)>-1){
alert("b中已有");
}
else{
document.all.b.value=document.all.b.value+document.all.d.value;
}
}
}
</script>
<table width="200" border="1"><tr>
<td><input type="text" name="a" value=""></td>
</tr>
<tr>
<td><input type="text" name="b" value=""></td>
</tr>
<tr>
<td><select name="c">
<option value="a">a</option>
<option value="b">b</option>
</select></td>
</tr>
<tr>
<td><select name="d">
<option value="0">0</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
<option value="6">6</option>
<option value="7">7</option>
<option value="8">8</option>
<option value="9">9</option>
</select></td>
</tr>
<tr>
<td><input type="button" name="button" onClick="javascript:ichange();" value="提交"></td>
</tr></table>