<form name="form1" method="post" action="">
第1题:<input type="radio" name="a1" value="A">A
<input type="radio" name="a1" value="B">B
<input type="radio" name="a1" value="C">C
<input type="radio" name="a1" value="D">D
<br>
第2题:<input type="radio" name="a2" value="A">A
<input type="radio" name="a2" value="B">B
<input type="radio" name="a2" value="C">C
<input type="radio" name="a2" value="D">D
<br>
第3题:<input type="radio" name="a3" value="A">A
<input type="radio" name="a3" value="B">B
<input type="radio" name="a3" value="C">C
<input type="radio" name="a3" value="D">D
<br>
第4题:<input type="radio" name="a4" value="A">A
<input type="radio" name="a4" value="B">B
<input type="radio" name="a4" value="C">C
<input type="radio" name="a4" value="D">D
<br>
<input type="button" name="Submit" onClick="cc(4)" value="完成">
</form>
<script>
function bb(num){
var f=document.getElementById("form1")
var ra=eval("f.a"+num);
var k=0;
for(var i=0;i<ra.length;i++){
if(ra[i].checked==true){
k=1;
break;
}
}
if(k==0) return false;
else return true;
}
function cc(maxNum){
var k="";
for(var i=1;i<=maxNum;i++){
if(!bb(i)){
k+="第"+i+"题您还没有选择答案！ \n";
}
}
if(k!=""){
alert(k);
}
else{
alert("答题完毕!");
}
}
</script>