React native 如何修复使用react native和express js调用localhost api时出现的[Error:Network Error]

我目前正在学习服务器端的React native和Express JS。所以现在我练习从expressjs调用api来响应本机，并使用axios来调用http请求。我的问题在我的cmd中，它显示[错误：网络错误]。更具体地说，我将向你们展示我的示例工作server.js和组件，以及我的cmd上的示例屏幕截图错误

[错误：网络错误]

服务器JS:

const express = require('express');
var cors = require('cors')
const bodyParser = require('body-parser');
const mysql = require('mysql');

const connection = mysql.createPool({
  host     : '192.168.61.1',
  user     : 'root',
  password : '',
  database : 'sample_db'
});

if(connection) {
    console.log(connection);
}


// Starting our app.
const app = express();

var cors = require('cors');

app.use(cors());

// Creating a GET route that returns data from the 'mobile' table.

app.get('/api/readings', function (req, res) {

    // Connecting to the database.
    connection.getConnection(function (err, connection) {

    // Executing the MySQL query (select all data from the 'mobile' table).

    connection.query('SELECT * FROM tbl_mobile', function (error, results, fields) {

      // If some error occurs, we throw an error.
      if (error) throw error;

      // Getting the 'response' from the database and sending it to our route. This is were the data is.
      res.send(results)
    });
  });
});

// get the specific meter

app.get('/api/readings/:id', function (req, res) {

    // Connecting to the database.
    connection.getConnection(function (err, connection) {

    // Executing the MySQL query (select all data from the 'mobile' table).

    connection.query('SELECT * FROM tbl_mobile WHERE id = ?',req.params.id, function (error, results, fields) {

      // If some error occurs, we throw an error.
      if (error) throw error;

      // Getting the 'response' from the database and sending it to our route. This is were the data is.
      res.send(results)
    });
  });
});



// Starting our server.
app.listen(3000, () => {
 console.log('http://192.168.61.1/api/readings');
});

Axios：

axios.get('http://192.168.61.1:3000/api/readings')
    .then(function (response) {
        // handle success
        console.log(response);
    })
    .catch(function (error) {
        // handle error
        console.log(error);
    })
    .then(function () {
        // always executed
    });

答复：

---

如果您运行的是android，则需要配置明文http流量。IP地址192.168.61.1似乎是网关IP地址。请检查您使用的机器IP地址是否正确。