javascript - Keep a timer (coded in JS) that will automatically change color of image after 3 seconds -

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i started learning js , saw below given example(in link) , thought of coding automatic bulb switch on /off modifying existing example code.

thought process : after user hits image of bulb 1st time , bulb automatically switch on / off. interval between switch on /off : 3 seconds. 1 hit whole process continues 2 mins or less.

code example : http://www.w3schools.com/js/tryit.asp?filename=tryjs_intro_lightbulb

existing code :

 <!doctype html>   <html>  <body>   <h1>javascript can change images</h1>   <img id="myimage" onclick="changeimage()" src="pic_bulboff.gif" width="100"      height="180">  <p>click light bulb turn on/off light.</p>   <script>  function changeimage() {    var image = document.getelementbyid('myimage');   if (image.src.match("bulbon")) {      image.src = "pic_bulboff.gif";    } else {      image.src = "pic_bulbon.gif";    }   }    </script>      </body>    </html>

code modification did :

<script> function changeimage() {  var t ; var image = document.getelementbyid('myimage');  while t < 90 {      t++ ; settimeout() : var delay= 3000 ; if (image.src.match("bulbon"))     image.src = "pic_bulboff.gif"; else      image.src = "pic_bulbon.gif";  }                        }  </script>

and above modified code nothing. working code change helpful me understand more js. thank you

var image = document.getelementbyid('myimage'); setinterval(function(){ if (image.src.match("bulbon")) {    image.src = "pic_bulboff.gif"; }else {     image.src = "pic_bulbon.gif";  }; },100);

this code make bubl change ever 0.1s


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