<select id=aaa>
<option>111111111</option>
</select>
<textarea id=bbb></textarea>
<input type=button value="add" onclick="doit()">
<script>
function doit(){
tt = document.all.aaa;
ss = document.all.bbb;
tt.options.length +=1;
tt.options[tt.options.length-1].innerText=ss.value;
tt.options[tt.options.length-1].value=ss.value;
}
</script>
<option>111111111</option>
</select>
<textarea id=bbb></textarea>
<input type=button value="add" onclick="doit()">
<script>
function doit(){
tt = document.all.aaa;
ss = document.all.bbb;
tt.options.length +=1;
tt.options[tt.options.length-1].innerText=ss.value;
tt.options[tt.options.length-1].value=ss.value;
}
</script>
<input id=demo>
<input type=button onclick=go(demo.value,result) value=add>
<select name=result size=10 multiple></select>
</form>
<script>
function go(val,obj){
obj[obj.length++].text=val;
}
</script>
<input id=demo>
<input type=button onclick=go(demo.value,result) value=添加>
<br><input type=button onclick=del(result) value=删除选择的><br>
<select name=result size=10 multiple></select>
</form>
<script>
function go(val,obj){
obj[obj.length++].text=val;
}
function del(obj){
for(i=0;i<obj.length;i++)
if(obj[i].selected)obj.remove(i--);
}
</script>
<input id=demo>
<input type=button onclick=go(demo.value,result) value=添加>
<br><input type=button onclick=del(result) value=删除选择的><br>
<select name=result size=10 multiple></select>
</form>
<script>
function go(val,obj){
var o=new Option(val,val)
o.selected=true;
obj.add(o);
}
function del(obj){
for(i=0;i<obj.length;i++)
if(obj[i].selected)obj.remove(i--);
}
</script>