我尝试使用fetch更新数据库项的内容。但是，我在控制台中收到403禁止错误。我没有在HTML模板中使用表单，只是将元素附加到div。日志显示CSRF令牌丢失。

document.addEventListener("DOMContentLoaded", function(){

    const button = document.querySelectorAll("#edit_profile")
    button.forEach(function(button){
        button.onclick = function(){
      
            const memberID = button.dataset.id;
            const usernameID = button.dataset.username;
            const username = document.getElementById(`username_${memberID}`);

            let edit_username = document.createElement("textarea");
            edit_username.setAttribute("rows", "1");
            edit_username.innerHTML = username.innerHTML
            edit_username.id = `edit_username_${memberID}`;
            edit_username.className = `form-control username ${usernameID}`;

            const saveButton = document.createElement("button");
            saveButton.innerHTML = "Save";
            saveButton.id = `saveButton_${memberID}`;
            saveButton.className = "btn btn-success col-3";
            saveButton.style.margin = "10px";

            document.getElementById(`edit_${memberID}`).append(edit_username);
            document.getElementById(`edit_${memberID}`).append(saveButton);

            saveButton.addEventListener("click", function(){
                edit_username = document.getElementById(`edit_username_${memberID}`);

                fetch(`/edit_profile/${memberID}`,{
                    method: "POST",
                    body: JSON.stringify({
                        username: edit_username.value,
                    })
                })
                .then(response => response.json())
                .then(result => {
                    console.log(result);
                    if(result[`error`]){
                    reset(memberID)
                    } 
                    else {
                        username.innerHTML = result.username;
                        reset(memberID) 
                        
                    }
                })
                .catch(error => {
                    console.error(error);
                })
               
            })

        }
    });