1const sleep = (milliseconds) => {
2  return new Promise(resolve => setTimeout(resolve, milliseconds))
3}
4
5/*Use like so*/
6
7async function timeSensativeAction(){ //must be async func
8  //do something here
9  await sleep(5000) //wait 5 seconds
10  //continue on...
11}

1function sleep(milliseconds) {
2  const date = Date.now();
3  let currentDate = null;
4  do {
5    currentDate = Date.now();
6  } while (currentDate - date < milliseconds);
7}
8
9console.log("Hello");
10sleep(2000);
11console.log("World!");

1function sleep(ms) {
2  return new Promise(resolve => setTimeout(resolve, ms));
3}
4
5async function demo() {
6  console.log('Taking a break...');
7  await sleep(2000);
8  console.log('Two seconds later, showing sleep in a loop...');
9
10  // Sleep in loop
11  for (let i = 0; i < 5; i++) {
12    if (i === 3)
13      await sleep(2000);
14    console.log(i);
15  }
16}
17
18demo();

1function sleepFor( sleepDuration ){
2    var now = new Date().getTime();
3    while(new Date().getTime() < now + sleepDuration){ /* do nothing */ } 
4}
5
6// Use like so:
7
8sleepFor(1000)
9alert("hi")

1// Sync version
2function sleep(sleepDuration){
3    var now = new Date().getTime();
4    while(new Date().getTime() < now + sleepDuration){ /* do nothing */ } 
5}

1//Javascipt is asyncronous so you can't pause/block code execution
2//You can delay doing something with setTimeout
3setTimeout(function(){
4 	alert("Sup!"); 
5}, 2000);//wait 2 seconds