Question

checkbox怎样控制select显示与隐藏，也就是选中checkbox那么就显示select，取消就隐藏

Answer 1

<script language="JavaScript">
function chg(){
if(document.getElementById("cb").checked==true){
document.getElementById("s1").style.display="";
}else{
document.getElementById("s1").style.display="none";
}
}
</script>
<input type="checkbox" name="cb" id="cb" value="" onclick="chg()">
<select name="s1" style="display:none">
<option>1</option>
<option>2</option>
<option>3</option>
</select>