form {
font-family: Arial, sans-serif;
margin: 20px;
}
label {
display: block;
margin: 10px 0;
}
input[type="radio"], input[type="checkbox"] {
margin-right: 10px;
}
function validateForm() {
var radios = document.getElementsByName('question1');
var isChecked = false;
for (var i = 0; i < radios.length; i++) {
if (radios[i].checked) {
isChecked = true;
break;
}
}
if (!isChecked) {
alert('请选择一个选项。');
return false;
}
return true;
}