如何在阻塞的nodejs中创建睡眠/延迟？

最好的解决方案是为您的LED创建单例控制器，该控制器将排队所有命令并以指定的延迟执行它们：

function LedController(timeout) {  this.timeout = timeout || 100;  this.queue = [];  this.ready = true;}LedController.prototype.send = function(cmd, callback) {  sendCmdToLed(cmd);  if (callback) callback();  // or simply `sendCmdToLed(cmd, callback)` if sendCmdToLed is async};LedController.prototype.exec = function() {  this.queue.push(arguments);  this.process();};LedController.prototype.process = function() {  if (this.queue.length === 0) return;  if (!this.ready) return;  var self = this;  this.ready = false;  this.send.apply(this, this.queue.shift());  setTimeout(function () {    self.ready = true;    self.process();  }, this.timeout);};var Led = new LedController();

现在您可以拨打电话

Led.exec

Led.exec(cmd, function() {  console.log('Command sent');});