javascript - why use setTimeout on this slideshow? -

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with this article create simple javascript slideshow. can't understand why used settimeout on last of codes. settimeout call 1 times function .

<html>  <script>  var images = new array();  images[0] = new image().src = "1.png";  images[1] = new image().src = "2.png";  images[2] = new image().src = "3.png";  images[3] = new image().src = "4.jpg";  if (!document.images){  console.log("your browser not support images class");    }  else {console.log("welcome slider")}      </script>  <body>  <img src = "1.png" name = "slide" id="slider" width="300" height="100" />  </body>  <script>  var step = 0  function slideit(){  //if browser not support image object, exit.   if (!document.images)   {  console.log("your browser doesn't support our site")}   document.getelementbyid('slider').src = images[step]   if (step<2)    step++   else    step=0       //call function "slideit()" every 2.5 seconds   settimeout("slideit()",2500)  }  slideit()  </script>  </html>

thanks

your code looping should because function called again settimeout @ end of function.

function slideit(){   // code    //call function "slideit()" again in 2.5 seconds  settimeout("slideit()",2500) } slideit(); // call

however not excellent programming. several issues not practice. oh , way, document.images has been supported in browsers since ie4

i code more without changing preloader:

<!doctype html> <html> <script> var step=0,images=[]; images[0] = new image().src = "1.png"; images[1] = new image().src = "2.png"; images[2] = new image().src = "3.png"; images[3] = new image().src = "4.jpg";  function slideit(){  document.getelementbyid('slider').src = images[step];  if (step>=2) step=0;  else step++; } window.onload=function() {  slideit(); // first time or wait 2.5 secs  setinterval(slideit,2500);  } </script> <body> <img src="1.png" name="slide" id="slider" width="300" height="100" /> </body> </html>

please have @ too

execute setinterval function without delay first time

where function , code 

slideit(); // first time or wait 2.5 secs setinterval(slideit,2500);

would replaced 

setinterval(function slideit() {   document.getelementbyid('slider').src = images[step];   if (step>=2) step=0;   else step++; }(), 2500);

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