我如何 return Unirest 的函数值并使用 Express 发送？

Question

我正在为我的编码训练营开发语言翻译应用程序。我在后端使用 Microsoft Text Translations API 来翻译用户输入以获得每个查询所需的输出。

我运行遇到了我编写的函数没有将数据返回到前端的问题 (Screenshot of inspector) even though the function is running correctly in the back end side (Screenshot of Terminal)。

目前转换代码如下：

function langTranslateJSON(startLang, endLang, textString) {
  let queryURL = `https://microsoft-azure-translation-v1.p.rapidapi.com/translate?from=${startLang}&to=${endLang}&text=${textString}`;
  unirest
    .get(queryURL)
    .header(
      "X-RapidAPI-Key",
      API_KEY
    )
    .end(result => {
    //data comes back as an XML string //
      let xmlString = result.body 
      
      parseString(xmlString, function (err, data) {
        console.log(data)
        return data
      })
    })
}

这是通往用户

的POST路线

 //Using Express//
 
 app.post("/api/Translate", function (req, res) {
    res.send(langTranslate.langTranslateJSON(
      req.body.translateFromLanguage,
      req.body.translateToLanguage,
      req.body.translateFrom));
  });

Answer 1

// notice 4th callback argument after textString argument
function langTranslateJSON(startLang, endLang, textString, callback) {
  let queryURL = `https://microsoft-azure-translation-v1.p.rapidapi.com/translate?from=${startLang}&to=${endLang}&text=${textString}`;
  unirest
    .get(queryURL)
    .header(
      "X-RapidAPI-Key",
      API_KEY
    )
    .end(result => {
    //data comes back as an XML string //
      let xmlString = result.body 

      parseString(xmlString, function (err, data) {
        console.log(data)
        // Fire the callback here and pass in the data result
        callback(data);
      })
    })
}

现在在你的 express POST 路由中你需要传入回调函数

 app.post("/api/Translate", function (req, res) {
  // first you call your langTraslateJSON method
  // notice the 4th argument is now passing in the callback function
  // when your method is run it will invoke the callback you are passing here
  // and pass the data to the callback. 
  // It will then invoke the Express res.send method with this data  
  langTranslate.langTranslateJSON(
      req.body.translateFromLanguage,
      req.body.translateToLanguage,
      req.body.translateFrom, function(myDataResponse){
         res.send(myDataResponse)
      })
  });

我如何 return Unirest 的函数值并使用 Express 发送？

How do I return the value of a function that Unirest and send that using Express?

javascript

json

express

unirest