Delay timing gpio on raspberry pi

Need Help With My Project
1

Hello i want to insert delay time between the gpio pin but when i pres V1 appears this error on terminal.

how to put the proper command delay time



var Blynk = require('blynk-library');

var Gpio = require('onoff').Gpio;

var led1 = new Gpio(27, 'out');

var led2 = new Gpio(18, 'out');

var led3 = new Gpio(17, 'out');

var AUTH = 'e3bacfb60e0b4305854082b499cc2df9';

var blynk = new Blynk.Blynk(AUTH);

var v1 = new blynk.VirtualPin(1);

v1.on('write', function(param) {

  if (param[0] == '1') {
    led1.writeSync(1);
    2000
    led1.writeSync(0);
    1000
    led2.writeSync(1);
    1000
    led2.writeSync(0);
    1000
    led3.writeSync(1);
    1000
    led3.writeSync(0);
  }else{
    led1.writeSync(1);
    2000
    led1.writeSync(0);
    
  }

  console.log('V1:', param[0]);
});


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/home/pi/my-awesome-project/index2.js:22
    delay (2000) ;
    ^

ReferenceError: delay is not defined
    at Blynk.VirtualPin.<anonymous> (/home/pi/my-awesome-project/index2.js:22:5)
    at emitOne (events.js:116:13)
    at Blynk.VirtualPin.emit (events.js:211:7)
    at Blynk.onReceive (/home/pi/my-awesome-project/node_modules/blynk-library/blynk.js:510:27)
    at exports.SslClient.<anonymous> (/home/pi/my-awesome-project/node_modules/blynk-library/blynk.js:607:50)
    at emitOne (events.js:116:13)
    at exports.SslClient.emit (events.js:211:7)
    at TLSSocket.<anonymous> (/home/pi/my-awesome-project/node_modules/blynk-library/blynk-node.js:212:16)
    at emitOne (events.js:116:13)
    at TLSSocket.emit (events.js:211:7)
2

Aside from the space in between the word delay and the bracketed time, your answer is in the error… I don’t believe delay() is a NodeJS recognised command.

Google for how to use sleep() or alternate timers in NodeJS, but be aware that i think it can case the same possible disconnection as delay() in C++