javascript - 从HTML获取付款金额以在Node.js文件中收费

我到处寻找答案，但没有找到解决办法。我正在使用条纹收费用户，然而，付款不应该硬编码，因为价格的变化取决于不同的问题回答。我想做的是获取确认页面（HTML）上给出的“总价格”，并将该价格记为Stripe（使用Node）。
我目前有标记化工作和收费是成功时，数额是硬编码，但我需要收费数额的变化。有人知道Stripe（www.Stripe.com）是否可以做到这一点吗？
我的app.js文件（部分）：

// charge route
app.post('/charge', (req, res) => {
  const amount = 2500; <-- needs to change to not be hardcoded

  stripe.customers.create({
    email: "[email protected]",
    source: req.body.mytoken
  })
  .then(customer =>  {
    stripe.charges.create({
    amount,
    description:'item desc',
    currency:'usd',
    customer:customer.id
  })})
  .then(charge => res.send('success'));
});

const port = process.env.PORT || 5000;

app.listen(port, () => {
  console.log(`Server started on port ${port}`);
});

更新
我还想从输入表单更新用户的电子邮件信息，而不是像现在这样硬编码：email: "[email protected]"
第二次更新
条纹形式：

<div class="" style="margin-top: 60px;">
  <h2 class="quote-info">Estimated total&#58; $<span id="new_text"></span> USD</h2>
</div>


   <!-- Payment form -->
   <form action="/charge" method="post" id="payment-form">
      <div class="form-row">
         <label for="card-element">
           Credit or debit card
         </label>
       <div id="card-element">
        <!-- a Stripe Element will be inserted here. -->
       </div>

       <!-- Used to display form errors -->
       <div id="card-errors"></div>
       </div>

        <button>Submit Payment</button>
   </form>

在脚本标记的HTML页底部找到的函数：

function stripeTokenHandler(token) {
    var form = document.getElementById('payment-form');
    var hiddenInput = document.createElement('input');

    hiddenInput.setAttribute('type', 'hidden');
    hiddenInput.setAttribute('name', 'stripeToken');
    hiddenInput.setAttribute('value', token.id);

    form.appendChild(hiddenInput);
    var formData = JSON.stringify({
      mytoken: token.id
    });

    $.ajax({
      type: "POST",
      url: "/charge",
      data: formData,
      success: function(){alert("done")},
      dataType: "json",
      contentType: "application/json"
    });
    form.submit();
  }

最佳答案

您需要在Express中从表单中检索POST数据。
方法1（隐藏输入）
基于当前实现的最小阻力路径。
首先，您需要确保将总金额从表单传递到后端：

function stripeTokenHandler(token) {
  var form = document.getElementById('payment-form');

  var token = document.createElement('input');
  token.setAttribute('type', 'hidden');
  token.setAttribute('name', 'stripeToken');
  token.setAttribute('value', token.id);

  var totalAmount = document.createElement('input');
  token.setAttribute('type', 'hidden');
  token.setAttribute('name', 'totalAmount');
  token.setAttribute('value', $('#new_text').innerHTML);
  // or, prefereably, grab this directly from the var you're using to update the #new_text span's value

  form.appendChild(token);
  form.appendChild(totalAmount);

  // You could also just use the variables here (i.e. token.id) instead of grabbing it from the inputs generated above
  var formData = JSON.stringify({
    mytoken: token.value,
    totalAmount: totalAmount.value
  });

  // You're not actually referencing the form here, so you don't technically need to append the inputs above.
  // I've only included them for consistency. You're setting the values to be submitted to /charge when you set
  // the variable formData above and then passing it via the data property of $.ajax below.
  $.ajax({
    type: "POST",
    url: "/charge",
    data: formData,
    success: function(){alert("done")},
    dataType: "json",
    contentType: "application/json"
  });
  form.submit();
}

那么你应该能够做到：

app.post('/charge', (req, res) => {
  const amount = req.param('totalAmount');
  ...

方法2（命名路由参数）
在这种情况下，您不会向表单添加隐藏的输入，而是更新action，使表单类似于：

action="/charge/TOTAL_AMOUNT/EMAIL"

然后修改快速路线以引用此值，如：

app.get('/charge/:totalAmount/:email', (req, res) => {
    const amount = req.params.totalAmount;
    const email = req.params.email;
    ...

Scotch.io also has a great explanation of handling POST parameters in Express.