点击单选按钮弹出登录框问题
有一组单选按钮 ，点击“是”在下面出现登录框。点击否不出现。但是如果我不断的点击“是”他就会不断的出现登录框。怎么解决？
代码如下：
<style>
div#blocks{
color:#CCCC33;margin-left:10px;
margin-top:5px;
font-size:12px;}
div#blocks input{width:60px;
height:16px;}
</style>
<script langage= "javascipt ">
function showbar(objtt){
var divnode=document.createElement( "DIV ");
divnode.id= "blocks ";
var spannode_a=document.createElement( "SPAN ");
var login=document.createTextNode( "用户名 ");
var area_a=document.createElement( "INPUT ");
area_a.id= "input_a ";
area_a.type= "text ";
var spannode_b=document.createElement( "SPAN ");
var passwords=document.createTextNode( "密码 ");
var area_b=document.createElement( "INPUT ");
area_b.id= "input_b ";
area_b.type= "password ";
divnode.appendChild(spannode_a);
spannode_a.appendChild(login);
divnode.appendChild(area_a);
divnode.appendChild(spannode_b);
spannode_b.appendChild(passwords);
divnode.appendChild(area_b);
objtt.appendChild(divnode);
}
</script>
</head>
<body id= "myBody ">
<h2> 插入表格 </h2>
<hr>
是 <input name= "aa " type= "radio " onclick= "showbar(myBody) ">
否 <input name= "aa " type= "radio ">
<br>
</body>
[解决办法]
办法很多
<style>
div#blocks{
color:#CCCC33;margin-left:10px;
margin-top:5px;
font-size:12px;}
div#blocks input{width:60px;
height:16px;}
</style>
<script langage= "javascipt ">
var isok=false
function showbar(objtt){
if(isok) return
var divnode=document.createElement( "DIV ");
divnode.id= "blocks ";
var spannode_a=document.createElement( "SPAN ");
var login=document.createTextNode( "用户名 ");
var area_a=document.createElement( "INPUT ");
area_a.id= "input_a ";
area_a.type= "text ";
var spannode_b=document.createElement( "SPAN ");
var passwords=document.createTextNode( "密码 ");
var area_b=document.createElement( "INPUT ");
area_b.id= "input_b ";
area_b.type= "password ";
divnode.appendChild(spannode_a);
spannode_a.appendChild(login);
divnode.appendChild(area_a);
divnode.appendChild(spannode_b);
spannode_b.appendChild(passwords);
divnode.appendChild(area_b);
objtt.appendChild(divnode);
isok = true
}
</script>
</head>
<body id= "myBody ">
<h2> 插入表格 </h2>
<hr>
是 <input name= "aa " type= "radio " onclick= "showbar(myBody) ">
否 <input name= "aa " type= "radio ">
<br/>
</body>