Jquery radio checked 的使用

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<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>checked demo</title>
  <style>
  input, label {
    line-height: 1.5em;
  }
  </style>
  <script src="https://code.jquery.com/jquery-3.5.0.js"></script>
</head>
<body>
 
<form>
  <div>
    <input type="radio" name="fruit" value="orange" id="orange">
    <label for="orange">orange</label>
  </div>
  <div>
    <input type="radio" name="fruit" value="apple" id="apple">
    <label for="apple">apple</label>
  </div>
  <div>
    <input type="radio" name="fruit" value="banana" id="banana">
    <label for="banana">banana</label>
  </div>
  <div id="log"></div>
</form>
 
<script>
$( "input" ).on( "click", function() {
  $( "#log" ).html( $( "input:checked" ).val() + " is checked!" );
});
</script>
 
</body>
</html>