图看不清楚var obj=document.getElementByTagName("select");
for(int i=1; i<obj.lenght; i++){
if(obj[i].value.equals("")){
arr[i] = obj.name;
}
alert(arr);
}
基本这样
for(int i=1; i<obj.lenght; i++){
if(obj[i].value.equals("")){
arr[i] = obj.name;
}
alert(arr);
}
基本这样
<input type="radio" name="group1" value="1" />
<input type="radio" name="group1" value="2" />
<input type="radio" name="group1" value="3" />
</div>
<hr />
<div>
<input type="radio" name="group2" value="1" />
<input type="radio" name="group2" value="2" />
<input type="radio" name="group2" value="3" />
</div>
<hr />
<input type="button" value="click" onclick="ck()" />function hasChecked(groupName)
{
var gn= document.getElementsByName(groupName);
for(var i=0;i<gn.length;i++)
{
if(gn[i].checked) return true;
}
return false;
}function ck()
{
if(!hasChecked('group1'))
alert('未选择 group 1');
if(!hasChecked('group2'))
alert('未选择 group 2');
}