下面的例子可对一个单选按钮进行选定和不选 - 在线编辑器

          <!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>蜜蜂教程(mifengjc.com)</title>
  <script>
    function check() {
      document.getElementById("red").checked = true
    }

    function uncheck() {
      document.getElementById("red").checked = false
    }
  </script>
</head>
<body>

  <form>
    你更喜欢哪种颜色?<br>
    <input type="radio" name="colors" id="red">红色<br>
    <input type="radio" name="colors" id="blue">蓝色<br>
    <input type="radio" name="colors" id="green">绿色
  </form>
  <button type="button" onclick="check()">选择 "红色"</button>
  <button type="button" onclick="uncheck()">不选择 "红色"</button>

</body>
</html>
        