===================== location 이용
<script>
    function write_function() {
        const check = confirm("글을 쓰시겠습니까?");
        if(check == true){
            alert("글쓰기로 이동합니다.")
            location.href="form/"
        } else {
            alert("취소하셨습니다.")
        }
}
</script>


<a class="btn btn-primary" onclick="write_function()"  role="button">글쓰기</a>

====================== form/ action  이용 name="functon_delete"
    function delete_function() {
        const check = confirm("정말로 삭제하시겠습니까?");
        if(check == true){
            alert("글을 삭제합니다.");
            const form = document.function_delete;
            form.action="../delete/{{ board.id }}";
            form.submit();
        } else {
            alert("취소하셨습니다.");
        }
     }


   <form id="delete-form" name="function_delete" method="post">
                {% csrf_token %}
                <input type="hidden" name="_method" value="delete"/>
                <button id="delete-btn" onclick="delete_function()" class="btn btn-danger">삭제</button>