显示选按钮中选中的 - 在线编辑器

          <!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>蜜蜂教程(mifengjc.com)</title>
  <script>
    function displayResult() {
      var radios = document.getElementsByName('colors');
      for (var i = 0, length = radios.length; i < length; i++) {
        if (radios[i].checked) {
          // 弹出选中值
          alert(radios[i].value);
          // 选中后退出循环
          break;
        }
      }
    }
  </script>
</head>
<body>

  <form>
    你更喜欢哪种颜色?<br>
    <input type="radio" name="colors" id="red" value="red">红色<br>
    <input type="radio" name="colors" id="blue" value="blue">蓝色<br>
    <input type="radio" name="colors" id="green" value="green">绿色
  </form>
  <button type="button" onclick="displayResult()">显示选中的值</button>

</body>
</html>
        