Javasipt:radioタグの操作の詳細

1、htmlコード:

2、jsコード:方法一:

 
  
var opinionCategory = document.getElementsByName('opinionCategory'); 
   
  
                 var opinionCategoryValue = 1;
                 for(var i=0;i                        if(opinionCategory[i].checked){
                                      opinionCategoryValue = opinionCategory[i].value;
                        }
                 }
 
 

方法2:

 
  
var form = document.getElementById('userOpinionForm'); 
   
  
                 var num = 0;
                 for(var i=0;i
                     if(form.opinionCategory[i].checked){
                         num++;
                     }
                 }