我正在尝试使用CommonJS模块将我的服务器端代码模块化。到目前为止,这是我的模块,在motorDriver.js
文件中具有函数:
var rpio = require('rpio');
function motorDriver() {
this.makeStep = function(pin) {
rpio.open(pin, rpio.OUTPUT, rpio.LOW);
/* On for 1 second */
rpio.write(pin, rpio.HIGH);
rpio.sleep(data.interval);
/* Off for half a second (500ms) */
rpio.write(pin, rpio.LOW);
}
}
module.exports = motorDriver;
然后我尝试将其导入并像在server.js
中那样使用它:
var motorDriver = require('./motorDriver');
io.on('connection', function (socket) {
var motor = motorDriver()
socket.on('make step', function () {
console.log("Make Step");
motor.makeStep(40)
});
});
当我按下按钮触发此套接字时,出现错误:
TypeError: Cannot read property 'makeStep' of undefined
at Socket.<anonymous> (/Users/gov-sur/Documents/CamSlider/server.js:38:15)
at Socket.emit (events.js:182:13)
at /Users/gov-sur/Documents/CamSlider/node_modules/socket.io/lib/socket.js:528:12
任何人都知道我在做错什么,或者我的错过理解在哪里?
谢谢!
答案 0 :(得分:0)
要导出整个模块,我只是单独导出了每个函数:
function makeStep (pin) {
rpio.open(pin, rpio.OUTPUT, rpio.LOW);
/* On for 1 second */
rpio.write(pin, rpio.HIGH);
rpio.sleep(0.0001);
/* Off for half a second (500ms) */
rpio.write(pin, rpio.LOW);
}
module.exports = {
makeStep
}
像这样,我能够像初始问题中所述使用它,而无需将其初始化为对象:
var motorDriver = require('./motorDriver');
io.on('connection', function (socket) {
var motor = motorDriver
socket.on('make step', function () {
console.log("Make Step");
motor.makeStep(40)
});
});