<script type="text/javascript">
var cs = function (o) {
return o.lb.options[o.lb.selectedIndex].value != "1";
};
</script>
<form action="?" method="get">
<select name="lb" id="lb">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
<input id="b1" type="submit" value="提交" onclick="return cs(this.form)">
</form>
var cs = function (o) {
return o.lb.options[o.lb.selectedIndex].value != "1";
};
</script>
<form action="?" method="get">
<select name="lb" id="lb">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
<input id="b1" type="submit" value="提交" onclick="return cs(this.form)">
</form>
<select name="lb" id="lb" onchange="javascript:chg();">
<option value="1" >1</option>
<option value="2" >2</option>
<option value="3" >3</option>
</select>
<input id="b1" type="submit" value="提交">
</form>
<script language=javascript>
function chg(){
if(document.frm.lb.value!=1){
document.frm.b1.disabled="true";
}else{
document.frm.b1.disabled="";
}
}
</script>
<form name="???" onSubmit="fuc()">
......
</form>