Question

我在网络开发的第一年，我有一个相对简单的javascript任务，其中一部分要我

＆＃39;编写JavaScript代码以输出属性＆＃39;角色＆＃39;和＆＃39;数据按钮号码＆＃39; （每次点击普通按钮（按钮0，按钮1，按钮2）时，使用jQuery方法.data。＆＃39;

我的答案是以下代码，但是当我提交时它是失败的测试，谁能告诉我哪里出错了？

$(document).ready(function() {
     $(".btn-default").click(function () {
    console.log($this.attr( "role"));
    console.log($this.data("data-button-number"));
    });

});

HTML

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <!-- The above 3 meta tags *must* come first in the head; any other head content must come *after* these tags -->
    <meta name="description" content="">
    <meta name="author" content="">

    <title>Jumbotron Template for Bootstrap</title>

    <!-- Bootstrap core CSS -->
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">

    <!-- Custom styles for this template -->
    <link href="index.css" rel="stylesheet">

  </head>

  <body>

    <nav class="navbar navbar-inverse navbar-fixed-top">
      <div class="container">
        <div class="navbar-header">
          <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
            <span class="sr-only">Toggle navigation</span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
          </button>
          <a class="navbar-brand" href="#">Project name</a>
        </div>
        <div id="navbar" class="navbar-collapse collapse">
          <form class="navbar-form navbar-right">
            <div class="form-group">
              <input type="text" placeholder="Email" class="form-control">
            </div>
            <div class="form-group">
              <input type="password" placeholder="Password" class="form-control">
            </div>
            <button class="btn btn-success btn-sign-in">Sign in</button>
          </form>
        </div><!--/.navbar-collapse -->
      </div>
    </nav>

    <div class="container">
      <!-- Example row of columns -->
      <div class="row">
        <div class="col-md-4">
          <h2>Heading</h2>
          <p>Donec id elit non mi porta gravida at eget metus. Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum nibh, ut fermentum massa justo sit amet risus. Etiam porta sem malesuada magna mollis euismod. Donec sed odio dui. </p>
          <p>
            <button class="btn btn-default" href="#" role="button" data-button-number="0">
              Button 0
            </button>
          </p>
        </div>
        <div class="col-md-4">
          <h2>Heading</h2>
          <p>Donec id elit non mi porta gravida at eget metus. Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum nibh, ut fermentum massa justo sit amet risus. Etiam porta sem malesuada magna mollis euismod. Donec sed odio dui. </p>
          <p>
            <button class="btn btn-default" href="#" role="button" data-button-number="1">
              Button 1
            </button>
          </p>
        </div>
        <div class="col-md-4">
          <h2>Heading</h2>
          <p>Donec sed odio dui. Cras justo odio, dapibus ac facilisis in, egestas eget quam. Vestibulum id ligula porta felis euismod semper. Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum nibh, ut fermentum massa justo sit amet risus.</p>
          <p>
            <button class="btn btn-default" href="#" role="button" data-button-number="2">
              Button 2
            </button>
          </p>
        </div>
      </div>

      <hr>

      <footer>
        <p>&copy; 2016 Company, Inc.</p>
      </footer>
    </div> <!-- /container -->


    <!-- Bootstrap core JavaScript
    ================================================== -->
    <!-- Placed at the end of the document so the pages load faster -->
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script>
    <script src="index.js"></script>
  </body>
</html>

事件和访问被点击的元素

0 个答案: