上的JavaScript RPI：GPIOCtrl不是一个函数

Question

大家好，我尝试使用以下

var gpio = require("pi-gpio"); 
var gpioPin = 4; 
var isOpened=false; 
var unlock = function(){ 
if(!isOpened){ 
/* Open the door lock */ 
gpio.write(gpioPin, 1, function() { 
isOpened = true; 
}); 
/*Lock door in 2 seconds*/ 
setTimeout(function() { 
gpio.write(gpioPin, 0, function() { 
isOpened = false; 
}); 
}, 2000);}} 

然后创建一个门锁如下：

var http = require('http'); var express = require('express'); 
var app = express(); 
var GPIOCtrl = require('./controller.js'); 
app.get('/unlock/', function(req, res){ 
GPIOCtrl.unlock(); 
}); 
app.listen(3000); 
console.log('App Server running at port 3000'); 

当我运行程序我得到消息应用服务器运行在端口3000，但是当我打电话时，我收到以下消息：

TypeError: GPIOCtrl.unlock is not a function 

我是什么做错了？

Answer 1

你必须export你的模块，如您controller.js如下：

var gpio = require("pi-gpio"), 
    gpioPin = 4, 
    isOpened = false, 

module.exports = { 
    unlock: function() { 
    if (!isOpened) { 
     /* Open the door lock */ 
     gpio.write(gpioPin, 1, function() { 
     isOpened = true; 
     }); 

     /*Lock door in 2 seconds*/ 
     setTimeout(function() { 
     gpio.write(gpioPin, 0, function() { 
      isOpened = false; 
     }); 
     }, 2000); 
    } 
    } 
}