检索无线电输入无效

Question

我正在使用JavaScript进行摇滚剪刀游戏。我从用户那里获得单选按钮的输入时遇到了一些麻烦。如果机器人赢了一轮，它也应该在他的分数上加1，现在每次都这样做。以下是我尝试过的代码：

HTML：

function playBot(){
 var num = Math.floor((Math.random() * 4) + 1); // generate number between 1 and 3 which represents the item bot has chosen
 console.log(num);
 var rock = document.getElementById("rock").value;
 var paper = document.getElementById("paper").value;
 var scissors = document.getElementById("scissors").value;
 var result = document.getElementById("result");
  // 1 = rock, 2 = paper, 3 = scissors
 if (rock.checked == true && num != 2){
   pl1 = pl1 + 1;
   document.getElementById("pl1").innerHTML = pl1;
 } else if (paper.checked == true && num != 3){
    pl1 = pl1 + 1;
    document.getElementById("pl1").innerHTML = pl1;
} else if (scissors.checked == true && num != 1){
   pl1 = pl1 + 1;
   document.getElementById("pl1").innerHTML = pl1;
} else {
  pl2 = pl2 + 1;
  document.getElementById("pl2").innerHTML = pl2;
}
}

和JavaScript：

for

我已尝试使用accordionPanel循环执行此操作，但这也不起作用。我尝试过的来源：How to get value of selected radio button?

Get Radio Button Value with Javascript

http://www.w3schools.com/jsref/prop_radio_checked.asp

提前致谢