// 在表单提交成功后的回调函数中
function handleFormSubmit() {
  // 显示成功消息
  document.getElementById("success-message").style.display = "block";

  // 设置定时器，在几秒钟后隐藏成功消息
  setTimeout(function() {
    document.getElementById("success-message").style.display = "none";
  }, 5000); // 5000毫秒即5秒钟
}

from django.shortcuts import render, redirect
from django.contrib import messages
from .forms import YourForm

def your_view(request):
    if request.method == 'POST':
        form = YourForm(request.POST)
        if form.is_valid():
            # 处理表单数据
            form.save()

            # 添加成功消息
            messages.success(request, '提交成功！')

            return redirect('your_view')
    else:
        form = YourForm()

    return render(request, 'your_template.html', {'form': form})

<!-- your_template.html -->
{% if messages %}
  {% for message in messages %}
    <div id="success-message" style="display: none;">{{ message }}</div>
  {% endfor %}
{% endif %}

<form method="post">
  {% csrf_token %}
  {{ form.as_p }}
  <button type="submit">提交</button>
</form>

<script>
  // 在这里添加前面提到的JavaScript代码
</script>