post 方法的问题(使用 fetch 和 express)-前端问题

A problem with a post method (using fetch and express)(post 方法的问题(使用 fetch 和 express))

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问题描述

我是一个非常初学者，所以我希望我的问题不是那么愚蠢.我想要做的是将经度和纬度从客户端 javascript 传递到服务器端的 node.js 中.我正在使用 fetch 和 express.js.

I'm a very beginner so I hope my question is not that stupid. What I want to do is to pass a longitude and a latitude from a client-side javascript into a node.js on a server-side. I'm using a fetch and express.js.

在我的html代码下面:

Below my html code:

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
  </head>
  <body>
      latitude: <span id="latitude"></span>&deg;<br />
      longitude: <span id="longitude"></span>&deg;<br />
    </p>
    <button id="geolocate">geolocate</button>
    <script src="main.js"></script>
  </body>
</html>

这是我的 main.js 中的一个小示例:

Here's a little sample from my main.js:

document.getElementById('geolocate').addEventListener('click', event => { 

    if ('geolocation' in navigator) { 
        console.log('geolocation available');
        navigator.geolocation.getCurrentPosition(position => {                    
            var X = position.coords.latitude;   
            var Y = position.coords.longitude;
            console.log(X, Y);
            document.getElementById('latitude').textContent = X;
            document.getElementById('longitude').textContent = Y;
            
             const data = {X, Y}
             const options = {
                method: 'POST',
                body: JSON.stringify(data),
                headers: {
                    'content-type': 'application/json'
                 }
             }
        fetch('/api', options);
      });
}  else {  
        console.log('geolocation not available');
      }
});

在这里你可以看到我的 node.js 代码:

And here you can see my node.js code:

const express = require('express');
const app = express();
app.listen(3000, () => console.log('listening at 3000'));

app.post('/api', (req, res) => {
  console.log(req);
});

当我运行它时，我收到一个 404 错误.我不知道我在这里做错了什么.如有任何建议，我将不胜感激.

When I run it I receive an 404 error. I have no idea what I'm doing wrong here. I'll be grateful for any advice.

这个应用程序正在我的 VPS 上运行.我还有一个带有 SSL 别名的域.为了运行 node.js，我使用 nodemon 作为进程.以下是日志:

This app is working on my VPS. I also have a domain with SSL aliases. To run node.js I use nodemon as a process. Here are the logs:

user_name_with_sudo  11451  0.5  3.6 663672 38152 pts/0    Sl+  11:05   0:00 node /bin/nodemon index.js $

如您所见，这是一个过程.

As you can see it's a process.

httpd service status - Oct 20 17:14:21 www.{my domain}.pl systemd[1]: Started The Apache HTTP Server.

如你所见，我正在开发 centOS7

As you can see I'm working on centOS7

推荐答案

尝试为获取添加完整路径.您正在 localhost 的 3000 端口上侦听服务器

Try to add full path for the fetch. You are listening server at localhost on the port 3000

main.js:

document.getElementById('geolocate').addEventListener('click', event => { 

if ('geolocation' in navigator) { 
    console.log('geolocation available');
    navigator.geolocation.getCurrentPosition(position => {                    
        var X = position.coords.latitude;   
        var Y = position.coords.longitude;
        console.log(X, Y);
        document.getElementById('latitude').textContent = X;
        document.getElementById('longitude').textContent = Y;
        
         const data = {X, Y}
         const options = {
            method: 'POST',
            body: JSON.stringify(data),
            headers: {
                'content-type': 'application/json'
             }
         }
    fetch('http://localhost:3000/api', options)
        .then(response => response.json())
        .then(data => {
            // if everting is ok should log the object  message: "Long lang sent to express" from server
            console.log(data)
        });
  });
...

服务器端就像 dat

const express = require('express');
const app = express();
app.listen(3000, () => console.log('listening at 3000'));

app.post('/api', (req, res) => {
  try {
      const {X, Y} = req.body
      console.log(X, Y)
      res.status(200).json({ message: "Long lang sent to express" })
   } catch (e) {
       res.status(500).json({ message: 'Something go wrong, try again' })
   }
});

尝试使用小写变量(例如:不使用 X, Y.. 但使用 x, y)如果它不是常量 :) Gl 与编程

Trying to use lowercase variables(example: not use X, Y.. but use x, y) if it not a constants :) Gl with programming

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