这样实现文本框的出现和隐藏

Question

<form  name=mxh3>
<div id=mxh1 style="position:absolute;visibility: hidden"><input value="dtest" type="text"></div>
<div id=mxh2 style="position:absolute;visibility: hidden"><input value="d" type="text"></div>
<!--<input  name=aa  type=radio  onclick="document.all.mxh2.style.visibility='visible'">显示--><br><br>
<input  name=aa  type=radio  onclick="change()">显示
<input  name=aa  type=radio  onclick="change1()">隐藏
<!--<input  name=aa  type=radio  onclick="document.all.mxh2.style.visibility='hidden'">隐藏-->
</form>
<script>
function change(){
  document.all.mxh2.style.visibility='visible';
  document.all.mxh1.style.visibility='hidden';
}
function change1(){
  document.all.mxh2.style.visibility='hidden';
  document.all.mxh1.style.visibility='visible';
}
</script>

Answer 1

<div id="roamUser" style="display:none">
<input type="button">
</div>function check()
{
    roamUser.style.display = "block"; 
}