jquery code在code pen中工作，但在vs code中不工作

我有一个Next按钮，它应该转到表单中的下一个字段集。它在代码笔（https://codepen.io/atakan/pen/nPOZZR）中工作，我发现它。也有人问过同样的问题，但解决方案应该只是添加jquery cdn调用，但没有工作。有人知道这是怎么回事吗？（没有错误消息，我使用的是Django版本4.2.3）这个html：

<!-- multistep form -->
{%load static%}

<head>
  <!-- ... your other links and scripts ... -->

  <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-easing/1.3/jquery.easing.min.js"></script>
  <script src="{% static 'assets/js/profile_completion.js' %}"></script>
  <link rel="stylesheet" href="{% static 'assets/css/profile_completion.css' %}">
</head>

<body>
  <form id="msform">
    <!-- progressbar -->
    <ul id="progressbar">
      <li class="active">Account Setup</li>
      <li>Social Profiles</li>
      <li>Personal Details</li>
    </ul>
    <!-- fieldsets -->
    <fieldset>
      <h2 class="fs-title">Create your account</h2>
      <h3 class="fs-subtitle">This is step 1</h3>
      <input type="text" name="email" placeholder="Email" />
      <input type="password" name="pass" placeholder="Password" />
      <input type="password" name="cpass" placeholder="Confirm Password" />
      <input type="button" name="next" class="next action-button" value="Next" />
    </fieldset>
    <fieldset>
      <h2 class="fs-title">Social Profiles</h2>
      <h3 class="fs-subtitle">Your presence on the social network</h3>
      <input type="text" name="twitter" placeholder="Twitter" />
      <input type="text" name="facebook" placeholder="Facebook" />
      <input type="text" name="gplus" placeholder="Google Plus" />
      <input type="button" name="previous" class="previous action-button" value="Previous" />
      <input type="button" name="next" class="next action-button" value="Next" />
    </fieldset>
    <fieldset>
      <h2 class="fs-title">Personal Details</h2>
      <h3 class="fs-subtitle">We will never sell it</h3>
      <input type="text" name="fname" placeholder="First Name" />
      <input type="text" name="lname" placeholder="Last Name" />
      <input type="text" name="phone" placeholder="Phone" />
      <textarea name="address" placeholder="Address"></textarea>
      <input type="button" name="previous" class="previous action-button" value="Previous" />
      <a href="https://twitter.com/GoktepeAtakan" class="submit action-button" target="_top">Submit</a>
    </fieldset>
  </form>
</body>

字符串
这个JavaScript：

//jQuery time
var current_fs, next_fs, previous_fs; //fieldsets
var left, opacity, scale; //fieldset properties which we will animate
var animating; //flag to prevent quick multi-click glitches

$(".next").click(function(){
    if(animating) return false;
    animating = true;
    
    current_fs = $(this).parent();
    next_fs = $(this).parent().next();
    
    //activate next step on progressbar using the index of next_fs
    $("#progressbar li").eq($("fieldset").index(next_fs)).addClass("active");
    
    //show the next fieldset
    next_fs.show(); 
    //hide the current fieldset with style
    current_fs.animate({opacity: 0}, {
        step: function(now, mx) {
            //as the opacity of current_fs reduces to 0 - stored in "now"
            //1. scale current_fs down to 80%
            scale = 1 - (1 - now) * 0.2;
            //2. bring next_fs from the right(50%)
            left = (now * 50)+"%";
            //3. increase opacity of next_fs to 1 as it moves in
            opacity = 1 - now;
            current_fs.css({
        'transform': 'scale('+scale+')',
        'position': 'absolute'
      });
            next_fs.css({'left': left, 'opacity': opacity});
        }, 
        duration: 800, 
        complete: function(){
            current_fs.hide();
            animating = false;
        }, 
        //this comes from the custom easing plugin
        easing: 'easeInOutBack'
    });
});

$(".previous").click(function(){
    if(animating) return false;
    animating = true;
    
    current_fs = $(this).parent();
    previous_fs = $(this).parent().prev();
    
    //de-activate current step on progressbar
    $("#progressbar li").eq($("fieldset").index(current_fs)).removeClass("active");
    
    //show the previous fieldset
    previous_fs.show(); 
    //hide the current fieldset with style
    current_fs.animate({opacity: 0}, {
        step: function(now, mx) {
            //as the opacity of current_fs reduces to 0 - stored in "now"
            //1. scale previous_fs from 80% to 100%
            scale = 0.8 + (1 - now) * 0.2;
            //2. take current_fs to the right(50%) - from 0%
            left = ((1-now) * 50)+"%";
            //3. increase opacity of previous_fs to 1 as it moves in
            opacity = 1 - now;
            current_fs.css({'left': left});
            previous_fs.css({'transform': 'scale('+scale+')', 'opacity': opacity});
        }, 
        duration: 800, 
        complete: function(){
            current_fs.hide();
            animating = false;
        }, 
        //this comes from the custom easing plugin
        easing: 'easeInOutBack'
    });
});

型
我尝试添加不同版本的jQuery。

jquery code在code pen中工作，但在vs code中不工作

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