Question

我检查过这种问题。但我没有找到任何。如果你找到了请告诉我我刚开始通过node.js和serialport编写javascript。有人解释我为什么出现这个错误？

/Applications/MAMP/htdocs/homeautomation/server.js:42
var sp = new serialPort(portName, {
         ^
TypeError: undefined is not a function
    at Object.<anonymous> (/Applications/MAMP/htdocs/homeautomation/server.js:42:10)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Function.Module.runMain (module.js:497:10)
    at startup (node.js:119:16)
    at node.js:901:3

这是我的首发代码

/*
 * dependencies
 */
var express = require('express'),
    server = require('http').createServer(app),
    io = require('socket.io').listen(server),
    serialPort = require('serialport').serialPort;

server.listen(3000);
console.log('listen on port 3000')

/*
 * Express
 */

var app = express();

// serve static files from index
app.configure(function(){
    app.use(express.static(__dirname + '/'));
});


// respon to web GET request on index.html
app.get('/', function (req, res){
    res.sendfile(__dirname + '/index.html');
});


/*
 * Serial Port Setup
 */

var portName = '/dev/tty.usb.serial-A501JUTF';
//var portName = '/dev/tty.usbmodem1421';
var readData = ''; //Array to hold the values read from the port

var sp = new serialPort(portName, {
    baudRate : 9600,
    dataBits : 8,
    parity : 'none',
    stopBits: 1,
    flowControl : false,
});

任何帮助将不胜感激。

Answer 1

您的代码是正确的，除非您使用serialPort库的require('serialport')对象，而实际上SerialPort需要使用undefined is not a function，因此var SerialPort = require("serialport") console.log(SerialPort.serialPort); // undefined console.log(SerialPort.SerialPort); // { [Function: SerialPort, ... }你遇到的错误。

{{1}}

有关示例用法，请参阅the documentation。

Answer 2

尝试一下。它运作完美。

var SerialPort = require('serialport');
var serialPort = SerialPort.serialPort;
var sp = new SerialPort("/dev/ttyACM0", { 
});

从serialport node.js创建新对象时出错

2 个答案: