简单问题!!急~~~~~~~~~~`

Question

form.all["r1"].value=""
改为
form.all["r1"].value==""

Answer 1

form.all["r1"].value=""
改为
form.all["r1"].value==""
改了后,还是没用呀

Answer 2

<script  language="javascript">
function checkform(form){
var length=form.all.length;

for(i=0;i<length;i++){

var radiobox=form.all[i];

 if(radiobox.type=="radio"){
    if(radiobox.checked==false)
    {
       window.alert("aa");
       break;
       }
   }
  }
return false;
}
</script>

Answer 3

form.all["r1"].value  这个 不是对象  他是个数组~:)

Answer 4

<script  language="javascript">
function checkform(form){
var bb=document.getElementsByName("r1");
for(var i=0;i<bb.length;i++){
if(bb[i].checked){
alert(bb[i].name+"被选中");
}
}
}
</script><form action="#" method="post" id="form1" onSubmit="return checkform(this)">
<table>
<tr>
<td><input type="radio" name="r1" value="1"> <input type="radio" name="r1" value="2"></td>
<td><input type="submit" name="submit"></td>
</tr>
</table>
</form>