感谢木野狐兄
checked=false;
var c=document.getElementsByName('channel[]');
n=c.length;
for (var i=0; i<n; i++)
{
if(c[i].checked)
{ checked=true;break;}
}
if(!checked) {
alert("请选择频道");
form.uploadButton.disabled=false;
return false;
}
checked=false;
var c=document.getElementsByName('channel[]');
n=c.length;
for (var i=0; i<n; i++)
{
if(c[i].checked)
{ checked=true;break;}
}
if(!checked) {
alert("请选择频道");
form.uploadButton.disabled=false;
return false;
}