我有一个问题，返回数据的“POST”方法到另一个函数，使它得到进一步的进程。我使用Node.js，JavaScript和Express作为后端。
下面是“server.js”中的相关代码：

app.post("/movies", function (req, res) {
    const imdbIDs = req.body; 
  
    if (!Array.isArray(imdbIDs)) {
      res.sendStatus(400); 
      return;
    }
  
    const apiKEY = '########';   // unvisible just for question
    const movies = [];
    
    
  
    imdbIDs.forEach((imdbID, index) => {
      const apiUrl = `http://www.omdbapi.com/?&apikey=${apiKEY}&i=${imdbID}`;
  
      http.get(apiUrl, (response) => {
        let responseData = '';
  
        response.on('data', (chunk) => {
          responseData += chunk;
        });
  
        response.on('end', () => {
          try {
            const movieData = JSON.parse(responseData);
  
            if (movieData.Response === 'True') {
              const movie = {
                Released: new Date(movieData.Released).toISOString(),
                Runtime: movieData.Runtime !== 'N/A' ? parseInt(movieData.Runtime) : null,
                Genres: movieData.Genre.split(',').map(genre => genre.trim()),
                Directors: movieData.Director.split(',').map(director => director.trim()),
                Writers: movieData.Writer.split(',').map(writer => writer.trim()),
                Actors: movieData.Actors.split(',').map(actor => actor.trim()),
                MetaScore: movieData.Metascore !== 'N/A' ? parseInt(movieData.Metascore) : null,
                imdbRating: Number(movieData.imdbRating)
                             
              };
              console.log(movie)   
              movies.push(movie);
            } else {
              console.error(`Error retrieving movie with imdbID ${imdbID}: ${movieData.Error}`);
            }
          } catch (error) {
            console.error('Error parsing movie data:', error);
          }

          if (index === imdbIDs.length - 1) {
            // Send the movies array as the response
            res.status(200).send(movies);           
          }
        });
      }).on('error', (error) => {
        console.error('Error fetching movie data:', error);
  
        if (index === imdbIDs.length - 1) {
          // Send the movies array as the response even if there was an error
          res.status(200).send(movies);   
          
        }
      });
    });
  });

这里是我想要处理接收数据“index.js”的函数：

function loadMovies(genre) {
  const xhr = new XMLHttpRequest();
  xhr.onload = function () {
    const mainElement = document.querySelector("main");

    while (mainElement.childElementCount > 0) {
      mainElement.firstChild.remove()
    }

    if (xhr.status === 200) {
      JSON.parse(xhr.responseText)
        .forEach(movie => new MovieBuilder(movie, deleteMovie).appendTo(mainElement))
    } else {

      mainElement.append(`Data could not be loadet, status ${xhr.status} - ${xhr.statusText}`);
    }
  }
  const url = new URL("/movies", location.href)
  if (genre) {
    url.searchParams.set("genre", genre)
  }
  xhr.open("GET", url)
  xhr.send()
}

我尝试创建一个“constmovies =（xhr.responseData）”，然后调用它，但得到的只是一个“undefined”值。总结一下：在“Server.js”中，我对一个表单发出“POST”请求，所有选中的框都应该存储在一个列表中。该列表应该在“index.js”中调用，其中可以动态构建html。