有多个radio要求radio要选 function check() { var radionum=0; var a = document.getElementsByTagName("input"); for (var i=0; i<a.length; i++){ if ((a[i].type == "radio")&&(a[i].checked)) radionum++; } if (radionum==0) { alert('you must choose one.'); return false; } return true; }
function check()
{
var radionum=0;
var a = document.getElementsByTagName("input");
for (var i=0; i<a.length; i++){
if ((a[i].type == "radio")&&(a[i].checked))
radionum++;
}
if (radionum==0)
{
alert('you must choose one.');
return false;
}
return true;
}