读取name="A.a"

function checkIsSel(objid){
	var select_options  =  document.getElementsByName(objid);
	var x = select_options.length;
	xx = 0;
	for(i = 0; i < x ; i++){
		if(select_options[i].checked){
            xx++
        }
	}
    if (xx == 0){
		return false;
    }else{
    	return true;
    }
    
}