如果获取请求失败，如何停止功能

Question

我正在使用 Google 验证码 v3 构建电子邮件表单。

我希望如果分数小于 1，则函数（请求）的其余部分应该结束。

但问题是，如果我将 return 语句添加到我的获取请求中，它就会退出 .then() 函数并且不会停止请求。

代码如下：

app.post(
  "/mail",
  (req, res) => {
    const url = `https://www.google.com/recaptcha/api/siteverify?secret=${process.env.SECRET_KEY}&response=${req.body.token}`;
    fetch(url, {
      method: "post",
    })
      .then((response) => response.json())
      .then((google_response) => {
        console.log(google_response);

        if ((google_response.success = false || google_response.score < 1)) {
          console.log("ROBOT ALERT");

          res.status(422).json({
            captcha: "Robot verification failed. Try again later",
          });
          return; //------------here I want to stop the continuation of the request----
        }
        return;
      })
      .catch((error) => {
        console.log(error);

        res.json({ captcha: "An unknown error occurred. Try again later" });
      });
    // Finds the validation errors in this request and wraps them in an object with handy functions
    const errors = validationResult(req);
    if (!errors.isEmpty()) {
      console.log(errors);

      return res.status(422).json({ errors: errors.array() });
    }
   

//If everything is ok then end request here.
    res.json({ success: true });
  }
})

Answer 1

在 then 里面做所有的事情：

fetch(url, options).then(response => response.json().then(data => {
  // do everything here
})).catch(e => {
  // handle error
})

Answer 2

你可以在if语句中使用return来在if语句被触发后停止执行函数:

app.post("/mail", (req, res) => {
  fetch(url, options)
    .then((response) => response.json())
    .then((googleResponse) => {
      if ((google_response.success = false || google_response.score < 1)) {
        console.log("ROBOT ALERT");
        return res.status(404).send({ captcha: "Robot verification failed. Try again later" });
        // Should stop here if condition is triggered
      }
      // Continue here if the condition is not triggered
    });
});

如果获取请求失败，如何停止功能

how to stop function if a fetch request fails

javascript

fetch

node.js

express

nodemailer