如题
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radio需要效验什么?
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是否选择？使用对象数组
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???pleas detail!
thank u!
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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;
}
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getElementsByTagName根据html标记获取相应对象