node.js

Question

我希望以递归方式遍历某些函数，以便在最后一个函数之后再次进入第一个函数并且它将永远存在。任何人都可以帮我解决这个问题吗？我还想知道是否有适当的教程或某些东西可以帮助我解决节点js循环和流控制中的这些问题。我虽然尝试了在线教程，但无法正确理解。

var util = require('util');
var async = require('async');
var SensorTag = require('./index');
var USE_READ = true;

SensorTag.discover(function(sensorTag) {
  console.log('discovered: ' + sensorTag);

  sensorTag.on('disconnect', function() {
    console.log('disconnected!');
    process.exit(0);
  });

  async.series([
  /*func 1*/
      function(callback) {
        console.log('connectAndSetUp');
        sensorTag.connectAndSetUp(callback);
      },
  /*func 2*/
      function(callback) {
        console.log('readDeviceName');
        sensorTag.readDeviceName(function(error, deviceName) {
          console.log('\tdevice name = ' + deviceName);
          callback();
        });
      },
   /*func 3*/
      function(callback) {
        console.log('readSystemId');
        sensorTag.readSystemId(function(error, systemId) {
          console.log('\tsystem id = ' + systemId);
          callback();
        });
      }
  })

})

当我执行它时，func 1 - ＆gt;功能2 - ＆gt; func 3然后挂起。我需要一次又一次地递归循环。

编辑代码：我试图循环使用某些功能，而不是全部

var util = require('util');
var async = require('async');
var SensorTag = require('./index');
var USE_READ = true;

SensorTag.discover(function(sensorTag) {
  console.log('discovered: ' + sensorTag);

  sensorTag.on('disconnect', function() {
    console.log('disconnected!');
    process.exit(0);
  });

//function loop(){
  async.series([
  /*func 1*/
      function(callback) {
        console.log('connectAndSetUp');
        sensorTag.connectAndSetUp(callback);
      },
      function loop(callback){
        /*func 2*/
      function(callback) {
        console.log('readDeviceName');
        sensorTag.readDeviceName(function(error, deviceName) {
          console.log('\tdevice name = ' + deviceName);
          callback();
        });
      },
   /*func 3*/
      function(callback) {
        console.log('readSystemId');
        sensorTag.readSystemId(function(error, systemId) {
          console.log('\tsystem id = ' + systemId);
          callback();
        });
      },
      function(callback){
        loop()
        callback()
      }

      }
/*
      function(callback) {
        console.log('readDeviceName');
        sensorTag.readDeviceName(function(error, deviceName) {
          console.log('\tdevice name = ' + deviceName);
          callback();
        });
      },

      function(callback) {
        console.log('readSystemId');
        sensorTag.readSystemId(function(error, systemId) {
          console.log('\tsystem id = ' + systemId);
          callback();
        });
      },*/
      /*func 4*/
      loop();

  ]);
}



})

Answer 1

您可以使用forever function from async，并在此调用中使用async.series

Answer 2

你可以做到

function loop(){
    async.series([
        //  your func here
    /*func 4*/
    , function(callback){
        loop()
        callback()
    }
}

修改

然后调用它开始

loop();

另一个编辑：

也许根本不需要异步

sensorTag.connectAndSetUp(readDevice);

function readDevice() {
   console.log('readDeviceName');
   sensorTag.readDeviceName(function(error, deviceName) {
       console.log('\tdevice name = ' + deviceName);
       readSystemId();
   });
}

function readSystemId() {
    console.log('readSystemId');
    sensorTag.readSystemId(function(error, systemId) {
        console.log('\tsystem id = ' + systemId);
        readDevice(); // start over again
    });
}