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index.htmlにname属性, value属性を設定し，views.pyで「if request.POST.get('name属性の値')=='value属性の値': 」というようにすればOKです．ご回答いただいた方々，ありがとうございました．
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ご回答いただいた方，特にtatamyiwathyさま，ありがとうございました．
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```ここに言語を入力
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(index.html)
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<a class="nav-link dropdown-toggle" id="navbarDropdownMenuLink" data-toggle="dropdown"
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aria-haspopup="true" aria-expanded="false">並替</a>
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<div class="dropdown-menu dropdown-primary" aria-labelledby="navbarDropdownMenuLink">
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<form action='' method='POST'>
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{% csrf_token %}
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<input type='submit' class="btn btn-success" name='order' value='降順'></p>
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<input type='submit' name='order' value='昇順'>
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<input type='submit' class="btn btn-success" name='order' value='昇順'></p>
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<input type='submit' name='order' value='降順'>降順</p>
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</form>
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</div>
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```
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```ここに言語を入力
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def Index(request):
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if request.POST
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if request.POST.get('order')=='昇順':
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post_list = Post.objects.all().order_by('-created_at')
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else:
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post_list = Post.objects.all().order_by('created_at')
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print(request.POST.get('order')) #コマンドプロンプトでの確認用
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context = {
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'post_list':post_list
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'post_list': post_list,
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}
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return render(request, 'myapp/index.html', context)
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```
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```
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参考)https://www.gesource.jp/programming/python/django/015.html
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