Question

<!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">
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    <title>Jquery alert example</title>
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    <link href="css/bootstrap.min.css" rel="stylesheet">

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    <link href="css/ie10-viewport-bug-workaround.css" rel="stylesheet">

    <link href="http://www.jqueryscript.net/css/jquerysctipttop.css" rel="stylesheet" type="text/css">

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      <script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
    <![endif]-->
  </head>

  <body>
      <div class="container-fluid">
        <script type="text/javascript">
        jQuery(document).ready(function(){
          jQuery('#event').click(function(){
            alert("hello world");
          });
        });
        </script>
        <input type='button' id='event' class='btn btn-success' value='click me'>
      </div><!--container ends here-->
    <!-- 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>window.jQuery || document.write('<script src="js/jquery.min.js"><\/script>')</script>
    <script src="js/bootstrap.min.js"></script>
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    <script src="js/ie10-viewport-bug-workaround.js"></script>
    <script src="js/wow.min.js"></script>
  </body>
</html>

当我点击提醒按钮时，事件无效。我也附加了jQuery文件。如果我从jQuery版本1升级到版本3，jQuery语法需要改变，这是我的另一个疑问。请告诉我我在哪里做错了并指导我如何避免这个问题。

Answer 1

放置以下script标记：

<script type="text/javascript">
    jQuery(document).ready(function(){
      jQuery('#event').click(function(){
        alert("hello world");
      });
    });
</script>

在jQuery脚本标记下：

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>

Answer 2

是的，在你的jquery代码之前把你的jquery库放在顶部。它将起作用，正确的写事件方式是： -

   jQuery('#event').on('click', function(){
            alert("hello world");
    });

Answer 3

在编写jquery的代码后首先导入基本的.js文件：

$('#btnID').click(function(){
alert('welcome')
});

点击按钮Jquery警报事件不起作用

3 个答案: