Javascript 错误[ERR_HTTP_HEADERS_SENT]：发送到客户端后无法设置头-如何修复

我是Node.js的新手，有一些问题

我正在使用“express”：“^4.17.1”和Node.js v14.4.0。和火基

我有一个错误：“ERROR[ERR\u HTTP\u HEADERS\u SENT]：发送到客户端后无法设置头” 我怎样才能解决这个问题

我的后端代码：

app.post("/business/:businessID/Party/:partyID/editParty", function(req, res) {

  let businessID = req.params.businessID;
  let partyID = req.params.partyID;
  let ref = database.ref('parties/' + partyID);

  ref.update({
    name: req.body.name,
    date: {
      day: req.body.date,
      openHour: req.body.openingHour,
      closeHour: req.body.closingHour
    },
  }, function(error) {
    if (error) {
      console.log("Error! can't update party");
      console.log(error);
      return res.redirect("/business/" + businessID + "/Party/" + partyID + "/editParty");
    } else {
      console.log("party updated!");
      return res.redirect("/business/" + businessID + "/Party/" + partyID);
    }
  });
});

我的前端代码：

<form action="/business/<%=party.businessID%>/Party/<%=party.id%>/editParty" method="POST">
        <button type="submit" class="btn btn-primary">Update Party!</button>
</form>

---

您正在尝试从异步调用返回。那么代码应该是什么样子的呢？

Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client
at ServerResponse.setHeader (_http_outgoing.js:533:11)
at ServerResponse.header (C:\Users\amzal\Desktop\Mingle\Mingle Website For Businesses\Mingle Website App\node_modules\express\lib\response.js:771:10)
at ServerResponse.send (C:\Users\amzal\Desktop\Mingle\Mingle Website For Businesses\Mingle Website App\node_modules\express\lib\response.js:170:12)
at done (C:\Users\amzal\Desktop\Mingle\Mingle Website For Businesses\Mingle Website App\node_modules\express\lib\response.js:1008:10)
at tryHandleCache (C:\Users\amzal\Desktop\Mingle\Mingle Website For Businesses\Mingle Website App\node_modules\ejs\lib\ejs.js:260:5)
at View.exports.renderFile [as engine] (C:\Users\amzal\Desktop\Mingle\Mingle Website For Businesses\Mingle Website App\node_modules\ejs\lib\ejs.js:485:10)
at View.render (C:\Users\amzal\Desktop\Mingle\Mingle Website For Businesses\Mingle Website App\node_modules\express\lib\view.js:135:8)
at tryRender (C:\Users\amzal\Desktop\Mingle\Mingle Website For Businesses\Mingle Website App\node_modules\express\lib\application.js:640:10)
at Function.render (C:\Users\amzal\Desktop\Mingle\Mingle Website For Businesses\Mingle Website App\node_modules\express\lib\application.js:592:3)
at ServerResponse.render (C:\Users\amzal\Desktop\Mingle\Mingle Website For Businesses\Mingle Website App\node_modules\express\lib\response.js:1012:7)