我正在嘗試插入用于計(jì)算需要存儲(chǔ)在數(shù)據(jù)庫(kù)中的總價(jià)格的 javascript，但是在我提交表單后，該字段在數(shù)據(jù)庫(kù)中為空白。我需要在網(wǎng)站上顯示并插入到數(shù)據(jù)庫(kù)中的總成本。我試圖把兩種形式的價(jià)格。一種是顯示javascript。另一種是將結(jié)果插入到數(shù)據(jù)庫(kù)中。我想我應(yīng)該編輯 HTML 代碼來(lái)解決這個(gè)問(wèn)題，但我不知道如何。請(qǐng)幫忙這是 HTML 代碼：Price: <span id="totalCost"></span><input type="hidden" name="totalCost">這是一些Javascript：var totalCostEl = document.querySelector('#totalCost');function calculateTotal() {  var unitCost = product_price[productEl.value];  var additionalCost = size_price[sizeEl.value] || 0;  var qty = quantityEl.value || 0;  totalCostEl.textContent = `Total cost: $${(unitCost + additionalCost) * qty}`;}這是php：if (!$con){die("Failed to connect to MySQL: " . mysqli_connect_error()); }else{ echo "Order Succeed!" ;}$var_Price = $_POST["totalCost"];$sql="INSERT INTO label (product, quantity, size, base, scents, ingredients, packaging, name, email, phone, message, totalCost)VALUES('$var_Product','$var_Quantity','$var_Size','$var_Base','$var_Scent','$var_Ingredients','$var_Packaging','$var_Name','$var_Email','$var_Phone','$var_Message','$var_Price')";這是數(shù)據(jù)庫(kù)：+----+------------+------------------------+------------+---------+-----------+----------+-------------------+---------------+------------+------------------------+----------------+-----------+| id | name       | email                  | phone      | message | product   | quantity | size              | base          | scents     | ingredients            | packaging      | totalCost |+----+------------+------------------------+------------+---------+-----------+----------+-------------------+---------------+------------+------------------------+----------------+-----------+| 22 | xxx        | xxx                    | xxx        |   None  | Face Soap |        1 | Regular Size(3oz) | Dry Skin      | Clove      | Shea Butter            | Co-Brand Label | 0         |我可以在網(wǎng)站上顯示總成本，但我無(wú)法將總成本插入到數(shù)據(jù)庫(kù)中。標(biāo)簽表中的所有其他內(nèi)容都已成功插入到數(shù)據(jù)庫(kù)中。如何將 totalCost javascript 插入到數(shù)據(jù)庫(kù)中。